A.Y. McDonald DuraMAC 5025PVSP Sump Pump 1/4 HP 120V Thermoplastic

Sump Pumps

Sump pumps keep groundwater out of basements and crawl spaces. This collection covers the A.Y. McDonald DuraMAC line: thermoplastic pumps for seasonal water and cast iron pumps for busy pits, in 1/4 to 1/2 HP with tethered, vertical or no switch, plus pedestal pumps, drop-in kits and two kinds of backup (12V battery and the water-powered Guardian). Cast iron models carry a 5-year warranty from installation. Time how fast your pit fills and run the Sump & Sewage Pump Calculator, or send us the numbers for an engineering-led selection. Call 1-888.510.4036 or email sales@watermainsupply.com.

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A.Y. McDonald Guardian Repair Parts | Emergency Back Up Sump Pump
A.Y. McDonald Guardian Repair Parts | Emergency Back Up Sump Pump

A.Y. McDonald

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A.Y. McDonald Guardian Repair Parts | Emergency Back Up Sump Pump

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A.Y. McDonald DuraMAC Cast Iron Submersible Sump Pump
A.Y. McDonald DuraMAC 5033CVSP Sump Pump 1/3 HP 120V Cast Iron

A.Y. McDonald

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A.Y. McDonald DuraMAC Cast Iron Submersible Sump Pump

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A.Y. McDonald Guardian Water-Powered Backup Sump Pump
A.Y. McDonald Radon Ready Sump Pump - Water Powered Emergency Back-Up

A.Y. McDonald

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A.Y. McDonald Guardian Water-Powered Backup Sump Pump

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Grundfos Unilift AP12 Drainage Pump
Grundfos Unilift AP12 stainless-steel submersible drainage pump with carrying handle

Grundfos

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Grundfos Unilift AP12 Drainage Pump

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Grundfos Unilift KP Submersible Pump
Grundfos Unilift KP stainless-steel submersible drainage pump with top discharge

Grundfos

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Grundfos Unilift KP Submersible Pump

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A.Y. McDonald DuraMAC Sump Pump and Basin Package - 1/4 HP Pump, 18 x 24 in Basin - 5025PTSPCWB
A.Y. McDonald DuraMAC 5025PTSPCWB Pump Basin Package 1/4 HP 120V Thermoplastic

A.Y. McDonald

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A.Y. McDonald DuraMAC Sump Pump and Basin Package - 1/4 HP Pump, 18 x 24 in Basin - 5025PTSPCWB

$449.53
A.Y. McDonald DuraMAC Crawl Space Sump Pump Kit - 3/10 HP Pump, Basin, 24 ft Hose - 5030CVSPCSK
A.Y. McDonald DuraMAC 5030CVSPCSK Crawl Space 3/10 HP 120V Cast Iron

A.Y. McDonald

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A.Y. McDonald DuraMAC Crawl Space Sump Pump Kit - 3/10 HP Pump, Basin, 24 ft Hose - 5030CVSPCSK

$654.80
A.Y. McDonald DuraMAC Laundry Sink Drain Pump System - 3/10 HP Pump, 6 Gallon Basin - 5030CVSPK
A.Y. McDonald DuraMAC 5030CVSPK Sink/Drain System 3/10 HP 120V Cast Iron

A.Y. McDonald

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A.Y. McDonald DuraMAC Laundry Sink Drain Pump System - 3/10 HP Pump, 6 Gallon Basin - 5030CVSPK

$518.84
A.Y. McDonald DuraMAC EZ Sump Kit - 1/3 HP Cast Iron Pump, Base, Check Valve and Pipe - 5033CVSPEZ
A.Y. McDonald DuraMAC 5033CVSPEZ EZ Sump Kit 1/3 HP 120V Cast Iron

A.Y. McDonald

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A.Y. McDonald DuraMAC EZ Sump Kit - 1/3 HP Cast Iron Pump, Base, Check Valve and Pipe - 5033CVSPEZ

$354.98
A.Y. McDonald DuraMAC Pedestal Sump Pump
A.Y. McDonald DuraMAC 5033PVPD Pedestal Pump 1/3 HP Thermoplastic

A.Y. McDonald

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A.Y. McDonald DuraMAC Pedestal Sump Pump

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A.Y. McDonald DuraMAC Thermoplastic Utility Pump - 1/5 HP 120V, Garden Hose Adapter - 5020PUUP
A.Y. McDonald DuraMAC 5020PUUP Utility Pump 1/5 HP 120V Thermoplastic

A.Y. McDonald

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A.Y. McDonald DuraMAC Thermoplastic Utility Pump - 1/5 HP 120V, Garden Hose Adapter - 5020PUUP

$144.65
A.Y. McDonald DuraMAC 12V Battery Backup Sump Pump System - Alarm Control, Vertical Switch - 5000PVSPBU
A.Y. McDonald DuraMAC 5000PVSPBU Battery Back-Up 12V DC Thermoplastic Sump Pump

A.Y. McDonald

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A.Y. McDonald DuraMAC 12V Battery Backup Sump Pump System - Alarm Control, Vertical Switch - 5000PVSPBU

$515.49
A.Y. McDonald DuraMAC Thermoplastic Submersible Sump Pump
A.Y. McDonald DuraMAC 5033PVSP Sump Pump 1/3 HP 120V Thermoplastic

A.Y. McDonald

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A.Y. McDonald DuraMAC Thermoplastic Submersible Sump Pump

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Sump Pumps

Sump Pumps · Basement & Crawl Space

Sump Pumps

Submersible, pedestal and backup sump pumps that keep groundwater out of basements and crawl spaces: thermoplastic and cast iron, 1/4 to 1/2 HP, with tethered, vertical or no switch, plus pre-assembled kits, battery or water-powered backups, and Grundfos Unilift stainless drainage pumps.

A.Y. McDonald DuraMAC EZ sump kit with cast iron sump pump
1/4–1-1/2 HPSubmersible & Pedestal
20–58 GPMAt 10 ft of Lift
Up to 52 ftMax Head (Unilift AP12)
Up to 5 YearsWarranty from Installation
2 BrandsA.Y. McDonald · Grundfos

A sump pump sits in a pit at the lowest point of a basement or crawl space and pumps out the groundwater that collects there before it reaches the floor. The right pump is the one that beats your pit’s inflow at your lift, with a switch that fits your basin and a backup for the storm that takes the power out.

We supply the A.Y. McDonald DuraMAC sump line, from a light thermoplastic 1/4 HP to a 1/2 HP cast iron pump, plus pedestal pumps, drop-in kits, float switches and two kinds of backup, and Grundfos Unilift stainless drainage pumps, and we size them: time how fast your pit fills, tell us the lift, and we come back with the pump and the reasoning. Call 1-888.510.4036 or email sales@watermainsupply.com. All products are genuine, factory-new equipment in original manufacturer packaging, sold and supported by Watermain Supply, an independent industrial supplier.

Will It Work for Me?

Answered from A.Y. McDonald’s and Grundfos’s published data.

Warranty

5 years from installation on the DuraMAC cast iron sump pumps, the 5050CVPD pedestal and the EZ, sink drain and crawl space kits. 3 years on the thermoplastic sump and utility pumps, the 5033PVPD and the basin package. 2 years on the battery backup. Grundfos Unilift: per the terms on each listing.

Reliability

Split capacitor motors rated for continuous duty with thermal protection, clog-resistant impellers (stainless steel on the 3/10 HP cast iron models), and replaceable piggyback floats, so a worn switch doesn’t mean a new pump.

Fit

Every DuraMAC sump pump lifts up to 25 ft on 120V. Vertical floats suit narrow basins; tethered floats need room to swing. Pedestal pumps need a basin of 12 in or larger. Grundfos Unilift reaches 32 ft (KP) and 52 ft (AP12).

Size It Now

Time the rise in your pit and enter your lift; the calculator returns the duty, the starts per hour and whether a 12V backup keeps up.

Sump & Sewage Pump CalculatorInflow, total head, cycling and backup check for sump pits

The Lines

Two DuraMAC pump families and two backups cover almost every basement; Grundfos Unilift covers sandy water and higher lifts.

A.Y. McDonald DuraMAC thermoplastic sump pump

DuraMAC Thermoplastic

1/4 and 1/3 HP · light and corrosion-free

20–28 GPMAt 10 ft
25 ftMax lift
Tethered or verticalFloat
3 yearsWarranty

Lightweight thermoplastic pumps for seasonal water in a standard basement, with a 1-1/4 in or 1-1/2 in discharge.

  • 5025PTSP tethered, 5025PVSP vertical (1/4 HP)
  • 5033PVSP vertical (1/3 HP)
  • 1/8 in solids, 10 ft cord
Best forLight to moderate inflow and replacements on a budget.
View Thermoplastic Pumps
A.Y. McDonald DuraMAC cast iron sump pump

DuraMAC Cast Iron

3/10, 1/3 and 1/2 HP · 11 builds

30–58 GPMAt 10 ft
25 ftMax lift
Tethered, vertical or noneSwitch
5 yearsWarranty

Cast iron pumps that shed motor heat into the water, for basements that run often. No-switch models run from a piggyback float or a control panel; 25 ft cords reach a distant outlet.

  • 1-1/2 in discharge, 3/8 to 1/2 in solids
  • Up to 70 GPM at zero head (1/2 HP)
  • 10 ft or 25 ft cords
Best forWet climates, high water tables and finished basements.
View Cast Iron Pumps
A.Y. McDonald Guardian water-powered backup sump pump

Backup Sump Pumps

Battery or water-powered

18 GPM12V at 10 ft
390–1,110 GPHGuardian at 10 ft
No batteryGuardian
Radon-readyGuardian option

The 5000PVSPBU runs from a 12V deep-cycle battery (not included) with an alarm and control unit. The Guardian runs on city water pressure, 29 to 90 PSI, with no battery to maintain; alarm and RPZ backflow versions are offered.

  • Both install beside the primary pump
  • Guardian output rises with supply pressure
  • Guardian made in the USA
Best forStorm-prone areas and finished basements where one failed cycle is costly.
View Guardian

Kits, Pedestal and Utility Pumps

A.Y. McDonald DuraMAC EZ sump kit

EZ Sump Kit

1/3 HP cast iron, pre-plumbed on a base with check valve and pipe5033CVSPEZ A.Y. McDonald DuraMAC sump pump and basin package

Pump and Basin Package

1/4 HP pump, 18 x 24 in basin, check valve5025PTSPCWB A.Y. McDonald DuraMAC crawl space sump pump kit

Crawl Space Kit

3/10 HP pump, pre-drilled basin, 24 ft hose5030CVSPCSK A.Y. McDonald DuraMAC sink drain pump system

Sink Drain System

6 gallon basin for laundry tubs and wet bars5030CVSPK A.Y. McDonald DuraMAC pedestal sump pump

Pedestal Pumps

1/3 and 1/2 HP, motor above the water5033PVPD · 5050CVPD A.Y. McDonald DuraMAC utility pump

Utility Pump

1/5 HP, garden hose adapter, fits a 6 in opening5020PUUP

Grundfos Unilift Stainless Drainage Pumps

Grundfos Unilift KP stainless steel drainage pump

Unilift KP

1/4 to 1/2 HP stainless drainage pump, 115V, to 65 GPM and 32 ft; no float, for basins with their own controlsKP 150 · 250 · 350 Grundfos Unilift AP12 stainless steel drainage pump

Unilift AP12

1/2 to 1-1/2 HP stainless drainage pump, manual or automatic float, to 140 GPM and 52 ftAP12.40 · AP12.50

Every Sump Pump Compared

Gallons per minute at each total head, as printed by A.Y. McDonald. Total head is the vertical lift plus pipe friction.

Pump HP Body Switch 0 ft 5 ft 10 ft 15 ft 20 ft 25 ft
5025PTSP / 5025PVSP 1/4 Thermoplastic Tethered / vertical 30 22 20 16 9 2
5033PVSP 1/3 Thermoplastic Vertical 40 34 28 22 12 2
5030 cast iron 3/10 Cast iron Tethered / vertical / none 46 36 30 25 12 1
5033 cast iron 1/3 Cast iron Tethered / vertical / none 60 56 50 35 15 6
5050 cast iron 1/2 Cast iron Vertical / none 70 66 58 48 25 10
5033PVPD pedestal 1/3 Thermoplastic base Adjustable float 50 45 38 35 15 —
5050CVPD pedestal 1/2 Cast iron base Adjustable float 60 55 45 30 12 5
5000PVSPBU 12V backup 12V DC Thermoplastic Vertical 23 22 18 13 8 —
5020PUUP utility 1/5 Thermoplastic None 26 21 14 10 7 1

Source: A.Y. McDonald Pumps by Baker catalog, rev 3/26, pp. 291–300 and 305. A dash is a head the pump does not reach. Kits use the 5025PTSP, 5030CVSP or 5033CVSP pump.

Quick rule: read the column for your total head, not the 0 ft column. Pick the pump that moves at least 1.5 times your measured inflow there. Between two that qualify, the cast iron pump runs cooler and lasts longer in a busy pit.

DuraMAC and Grundfos Unilift

Both brands are in this collection. Range maximums are each manufacturer’s published ceilings for the largest model, not a duty point.

Feature DuraMAC cast iron Grundfos Unilift KP Grundfos Unilift AP12
HP 3/10, 1/3, 1/2 1/4, 1/3, 1/2 1/2, 1, 1-1/2
Construction Cast iron AISI 304 stainless AISI 304 / 316 stainless
Level control Tethered, vertical or no switch No float switch on the models we list Manual or automatic float
Voltage 120V 115V 115V or 230V
Discharge 1-1/2 in 1-1/4 in NPT 1-1/2 or 2 in NPT
Solids 3/8–1/2 in 0.4 in 0.4 in
Cord 10 or 25 ft 25 ft 25 ft
Max flow (range) 70 GPM 65 GPM 140 GPM
Max head (range) 25 ft 32 ft 52 ft
Verdict: Grundfos Unilift wins on materials: all-stainless pumps that handle sandy water and portable drainage, and the AP12 reaches 1-1/2 HP, 230V, 140 GPM and 52 ft, well past any DuraMAC sump pump. DuraMAC wins as a basement sump pump: a built-in float in the switch type your basin needs, cast iron that runs cool in a busy pit, a 5-year warranty on the cast iron models, and published flow at every head on one page.

Selection Guide

Situation Measured inflow Start here Notes
Seasonal water, standard basement Under about 10 GPM 5025PTSP / 5025PVSP or 5033PVSP Thermoplastic, 3-year warranty
Regular inflow, finished basement 10 to 30 GPM 5033CVSP or 5033CTSP Cast iron, 5-year warranty
High water table, heavy storms 30 to 38 GPM 5050CVSP Add a backup
Basin with its own controls Any CUSP no-switch models Piggyback float or control panel
Small basin, motor kept dry Up to about 25 GPM 5033PVPD or 5050CVPD pedestal Basin 12 in or larger
Crawl space Light 5030CVSPCSK kit Pre-drilled basin and hose
Sandy or gritty water, portable drainage Up to about 30 GPM Grundfos Unilift KP Stainless; no float on the KP models we list
High lift or heavy inflow, 230V available Beyond the DuraMAC range Grundfos Unilift AP12 To 140 GPM and 52 ft; automatic float option
Laundry tub or wet bar Gray water 5030CVSPK sink drain system 6 gallon basin
Power-outage protection, city water Up to about 10 GPM (60 PSI supply) Guardian 747H20 No battery; 29–90 PSI supply
Power-outage protection, no city water Up to about 12 GPM 5000PVSPBU 12V deep-cycle battery not included

Inflow ranges assume about 10 ft of total head. Above that, check the comparison table at your head.

Sizing a Sump Pump

Two measurements decide it: how fast the pit fills, and how high the water has to go.

1. Measure the inflow

In wet weather, unplug the pump and time how far the water rises. An 18 in basin holds about 1.1 gallons per inch, so inflow in GPM = 1.1 × inches risen ÷ minutes. Multiply by 1.5 for margin.

2. Work out the total head

Total head = the vertical lift from the pit floor to the highest point of the discharge + friction in the pipe and fittings. In a typical basement with a short 1-1/2 in run, friction adds only a foot or two.

Worked example: an 18 in pit rises 12 in in 1 minute during a storm: 1.1 × 12 ÷ 1 = 13 GPM, times 1.5 = 20 GPM needed. Lift is 12 ft. The 1/4 HP thermoplastic pumps make 20 GPM at 10 ft and 16 GPM at 15 ft: marginal. The 1/3 HP cast iron pump makes 50 GPM at 10 ft and 35 GPM at 15 ft: the right pump, with room to spare.
Don’t oversize either: a pump far bigger than the inflow empties the pit in seconds and starts very often. A wider float span or a bigger basin lengthens each run. The calculator shows the starts per hour for your basin.

Run your numbers in the Sump & Sewage Pump Calculator.

Choosing the Switch, the Body and the Backup

Vertical float

Rides up and down a rod on the pump: short travel, fits narrow basins where a swinging float would catch on the wall.

Tethered float

Swings on its cord: a longer run between starts, but it needs room in the basin to move freely.

No switch

The CUSP models plug in behind a piggyback float or run from a control panel. Use them where the basin already has its own level controls.

Thermoplastic or cast iron

Thermoplastic is light and corrosion-free. Cast iron sheds motor heat into the water, which suits a pit that runs often, and carries the 5-year warranty.

Battery backup

Runs on a 12V deep-cycle battery when the power or the primary pump fails, with an alarm and control unit. Keep the battery tested and charged.

Water-powered backup

The Guardian uses city water pressure and needs no battery. Output rises with supply pressure: about 390 GPH at 30 PSI to 1,110 GPH at 80 PSI, at 10 ft of lift.

Floats and Parts

A.Y. McDonald DuraMAC replacement float switch

Replacement Float Switch

Vertical or tethered, 10 or 25 ft piggyback cord

 A.Y. McDonald DuraMAC mounting block

Mounting Block

Raises the pump off the basin floor

 A.Y. McDonald DuraMAC battery backup sump pump

Battery Backup

12V DC pump with alarm and control unit

 A.Y. McDonald Guardian repair parts

Guardian Repair Parts

Floats, switch valves, jet and suction kits

All parts are genuine, factory-new A.Y. McDonald parts. See all sump, sewage and effluent accessories.

Why Size It With Watermain Supply

Engineering-led sizing

We work from your inflow and lift and check the pump on its published table before we quote.

Multi-brand honesty

We sell A.Y. McDonald and Grundfos drainage pumps. If one is not the right fit, we will say so.

The whole pit

Pump, float, check valve, basin and backup on one order, matched to each other.

Parts and aftermarket

Replacement floats, mounting blocks and backup parts listed by part number.

Contractor accounts

Account options for plumbers and waterproofing contractors; ask us.

Houston and Gulf Coast

Based in Houston, shipping nationwide, with people who answer the phone and size pumps.

Frequently Asked Questions

What size sump pump do I need?

Time how fast your pit fills with the pump off, multiply by 1.5, and pick a pump that moves that flow at your lift in the comparison table. Most basements land on a 1/3 HP pump.

Thermoplastic or cast iron?

Thermoplastic is light, corrosion-free and economical for seasonal water. Cast iron sheds motor heat into the water, suits pits that run often, and carries a 5-year warranty on the DuraMAC models.

Tethered or vertical float?

Vertical floats fit narrow basins. Tethered floats give a longer run between starts but need room to swing. If your basin is tight, choose vertical.

What is the warranty?

5 years from installation on the DuraMAC cast iron sump pumps, the 5050CVPD and the EZ, sink drain and crawl space kits; 3 years on the thermoplastic, utility, 5033PVPD and basin package; 2 years on the battery backup.

Battery or water-powered backup?

A water-powered Guardian needs no battery and runs as long as the city water pressure holds (29 to 90 PSI). A 12V battery backup works without city water but needs a maintained battery. Check your local code for backflow requirements on the Guardian; RPZ versions are available.

What is a no-switch (CUSP) pump for?

Basins with their own level controls: a piggyback float, an alarm panel or a duplex control panel. The pump runs whenever it has power.

When is a stainless Grundfos Unilift the better choice?

For sandy or gritty water, portable drainage, or a lift beyond 25 ft: the AP12 reaches 52 ft and 140 GPM. For an everyday basement pit with a built-in float, a DuraMAC is the simpler fit.

Can a sump pump handle a laundry tub?

Use the 5030CVSPK sink drain system, built for laundry tubs, washers, wet bars and dehumidifiers. A toilet needs a sewage pump that passes 2 in solids.

Can you size it for me?

Yes. Send the pit diameter, how fast it fills and the lift, and we come back with the pump, switch and backup. Call 1-888.510.4036.

Ready to Size Your Sump Pump

Run the calculator, or send us your pit size, fill time and lift, and we come back with the pump, switch and backup.

1-888.510.4036Sump & Sewage Pump CalculatorEmail a Sizing RequestRequest a Quote
Technical data on this page is taken from A.Y. McDonald and Grundfos product literature and is subject to change by the manufacturer. Confirm against the current installation manual before specifying.
A.Y. McDonald, DuraMAC, Guardian, Grundfos and Unilift are trademarks of their respective owners, used here for product identification only.
Watermain Supply is a DBA of E4 Industrial LLC, an independent industrial supplier based in Houston, Texas.