A.Y. McDonald 25000 Series J - 5 GPM 4" Thermoplastic Pump End, 1/2-3/4 HP
A.Y. McDonald 25000 Series M - 25 GPM Pump End performance curve: total head vs flow by horsepower, Pumps by Baker catalog p. 104
A.Y. McDonald 25000 Series J - 5 GPM 4" Thermoplastic Pump End, 1/2-3/4 HP
A.Y. McDonald 25000 Series M - 25 GPM Pump End performance curve: total head vs flow by horsepower, Pumps by Baker catalog p. 104

A.Y. McDonald 25000 Series M - 25 GPM 4 in Thermoplastic Submersible Pump End

HP: 1/2 HP
Model - Head: 25050M - 74 ft at 25 GPM

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$260.17
SKU: 6630-435
Weight : 5.0 lb
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Description
A.Y. McDonald · Submersible Pump End
25000 Series M - 25 GPM Pump End
Thermoplastic 4 in pump end for Baker NEMA 4 in motors, 1/2 to 2 HP, 5 models.
74-213 ft at 25 GPM
1/2-2 HP
Fits NEMA 4 in Motors
324 ft Max Head (Shut-off)
1 1/4 in NPT Discharge
Built-In Check Valve
3 3/4 in Dia x 12.6-19.3 in L
5-9 lb Weight
What Ships and What It Needs to Run

Included: the 25000 Series M - 25 GPM pump end with its built-in check valve.

Motor required, ordered separately: a Baker 4 in motor of the same horsepower. Part numbers for the 230V motors are in the motor table under Models & Performance.

And the motor’s control: two-wire motors need none; single-phase three-wire motors need a control box; three-phase motors need a starter kit.

Overview

The 25000 Series M - 25 GPM pump end is the hydraulic end of Baker’s 25000 Series 4 in submersible pump, sold without the motor. It mounts on a NEMA 4 in Baker motor of the same horsepower, to build a new pump or rebuild one in the field.

The discharge head is thermoplastic (Noryl) with a removable check valve; the bowls, shell and shaft are stainless steel.

This listing covers 1/2 to 2 HP (5 models), all with a 1 1/4 in NPT discharge.

Genuine A.Y. McDonald equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier. Watermain Supply is an Authorized Stocking A.Y. McDonald and Baker Water Systems Distributor.
A.Y. McDonald Limited Warranty

Covered for 2 years from the date of manufacture or 1 year from the date of installation, whichever comes first, under A.Y. McDonald’s standard limited warranty for Baker products.

Room to Grow

One pump end per motor. Need more head later? Step up in horsepower within the M - 25 GPM class with the matching larger motor. Need more flow? Move to a higher flow class of the 25000 Series; every class uses the same 1 1/4 in NPT discharge, so the drop pipe connection stays the same.

Shared Specifications
Included Pump end with built-in check valve
Discharge 1 1/4 in NPT (female)
Pump diameter 3 3/4 in with cable guard
Motor fit NEMA 4 in Baker submersible motor of the same horsepower
Well size 4 in and larger
Check valve Built in
App connection None

Source: Pumps by Baker catalog (Sept 2025, rev 3/26), pp. 103-104.

Models & Performance — Will It Do What You Need?

Find your horsepower in the row, then read across. Total head is the lift from the pumping water level to the discharge, plus the pressure you want at the tank (2.31 ft for every PSI), plus friction in the drop pipe.

Total head in feet · curves end at 30.5–38.5 GPM

HP 0 GPM (Shut-off) 7.5 GPM 20 GPM 27.5 GPM 30 GPM
1/2 HP 118 ft 118 ft 96 ft 61 ft 47 ft
3/4 HP 150 ft 153 ft 130 ft 90 ft 74 ft
1 HP 205 ft 202 ft 161 ft 117 ft 100 ft
1 1/2 HP 264 ft 256 ft 209 ft 150 ft 127 ft
2 HP 324 ft 308 ft 254 ft 186 ft 154 ft

Read from the published curve in the Pumps by Baker catalog (Sept 2025, rev 3/26), p. 104, digitized and rounded down, at the flows nearest 20%, 50% and 75% of the curve’s 38.5 GPM end. 0 GPM is the printed shut-off. For the 1 HP, 1 1/2 HP and 2 HP curves, the published curve and A.Y. McDonald’s printed output tables disagree by about 10, 16 and 27 ft on average; the head figures are read from the curve, and the output tables below are the printed figures. The last column is the last flow every curve reaches; the curve ends are named in the table title.

Output in GPM at 30 PSI (switch cut-in), by depth to water

HP 25 ft 50 ft 75 ft 100 ft 125 ft 150 ft 175 ft
1/2 HP 20 12 — — — — —
3/4 HP 27 20 14 11 — — —
1 HP 31 28 25 19 13 12 —
1 1/2 HP — 32 30 27 24 21 17
2 HP — — 32 31 29 27 25

Output in GPM at 50 PSI (switch cut-out), by depth to water

HP 25 ft 50 ft 75 ft 100 ft 125 ft 150 ft 175 ft
1/2 HP — — — — — — —
3/4 HP 13 — — — — — —
1 HP 25 21 14 11 — — —
1 1/2 HP 30 28 26 22 18 13 —
2 HP 34 32 30 27 26 22 17

Output tables as printed in the Pumps by Baker catalog (Sept 2025, rev 3/26), p. 104, at the 30 and 50 PSI rows. Riser-pipe friction is not included (manufacturer note): add it for long or small drop pipe. — marks a point A.Y. McDonald does not print for that horsepower.

Baker 4 in motor by horsepower (230V unless marked, ordered separately)

HP Motor
1/2 HP 2-wire 3132-005 · 3-wire 3132-004 · 3Ph 3132-525
3/4 HP 2-wire 3132-006 · 3-wire 3132-000 · 3Ph 3132-527
1 HP 2-wire 3132-007 · 3-wire 3132-001 · 3Ph 3132-529
1 1/2 HP 2-wire 3132-009 · 3-wire 3132-002 · 3Ph 3132-531
2 HP 3-wire 3132-510 · 3Ph 3132-534

Best operating range: the published curve shades the most efficient operating range for each model; the catalog prints no figures for it. The curve is in the image gallery.

Before You Buy — The Limits That Decide the Fit
Motor NEMA 4 in Baker submersible motor of the same horsepower; the pump end does not run without one
Motor control Two-wire motors: none. Single-phase three-wire: control box. Three-phase: starter kit
Well size 4 in casing and larger; the pump end is 3 3/4 in diameter with the cable guard
Riser friction Not included in the output tables; add it before choosing
Pairing One pump end per motor, one pump per well
Materials of Construction
Discharge head Noryl, 1 1/4 in NPT thread
Motor adapter Noryl, NEMA standard
Check valve POM, removable
External shell Stainless steel 304, polished
Impellers Noryl
Diffusers Polycarbonate
Bearing Polyacetal
Shaft coupling Stainless steel 304, NEMA standard
Strainer Stainless steel 304
Shaft Stainless steel 304
Cable guard Stainless steel 304

Source: Pumps by Baker catalog (Sept 2025, rev 3/26), pp. 91-92.

For engineering-led sizing and selection support or a factory submittal, email sales@watermainsupply.com or call 1-888.510.4036.
© Watermain Supply — A division of E4 Industrial LLC
Data Sheet
Pumps by Baker 25000 Series Guide
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