DAB submersible well pumps in two borehole diameters. The 3 in S3 fits narrow cased wells at 5, 10 and 15 GPM; the 4 in S4 covers 5 to 25 GPM as a complete pump and up to 90 GPM as a bare pump end. Both use sand-resistant technopolymer hydraulics and stainless construction, with an NSF/ANSI 61 pump end and UL/CSA water-filled Tesla motors — 115 V or 230 V, 2-wire or 3-wire, all US 60 Hz. For engineering-led sizing on your well depth, flow and pressure target, call 1-888.510.4036 or email sales@watermainsupply.com.
DAB S3 3 in Multistage Submersible Well Pump - Two-Wire Stainless Motor, Sand Resistant, NSF61, 5 to 15 GPM
Price
From $935.38
DAB Submersible Well Pumps
DAB Pumps
DAB Submersible Well Pumps S3 & S4 Stainless Multistage
Sand-resistant 3 in and 4 in borehole pumps with stainless hydraulics, an NSF/ANSI 61 pump end and a water-filled Tesla motor — sold complete or as a bare pump end, sized on well depth, flow and pressure rather than the headline specs.
3 & 4 inWell sizes
5–90 GPMNominal flow
To 1500 ftMax head
0.5–10 HPMotor range
NSF 61 / 372UL & CSA listed
DAB Pumps is an Italian manufacturer with a U.S. operation in Ladson, South Carolina. Its groundwater line puts a full multistage well pump inside two borehole diameters on one platform: technopolymer impellers carried on stainless steel adjustment rings, a stainless liner, shaft and coupling, an integrated suction filter, and a removable non-return valve. The pump end is NSF/ANSI 61 approved for drinking water and the water-filled Tesla motor is UL and CSA listed and rated for variable-frequency-drive operation from 30 to 60 Hz.
Watermain Supply supplies the U.S. 60 Hz S3 and S4 range with correct voltages and two-wire or three-wire motors, backed by an engineering-led sales team that sizes to your well depth, flow and inlet pressure. This page compares both families and every nominal series, and puts DAB head to head with the A.Y. McDonald / Baker and Grundfos pumps we also carry, so you can select on the numbers — or call 1-888.510.4036 and we will size it for you.
The DAB Well Pump Line
One sand-resistant platform in two well diameters, sold as a complete pump or a bare hydraulic end.
DAB S4
4 in complete submersible
5–25 GPMcomplete flow
to 810 fthead
0.5–1.5 HPcomplete
2 or 3-wire115 / 230V
The 4 in workhorse, supplied complete with a water-filled Tesla motor. Six nominal series — 5, 7, 10, 15, 20 and 25 GPM — each in two-wire (no control box) or three-wire form. Technopolymer impellers on stainless adjustment rings pass up to 5.42 lb/in³ of sand.
Key specifications
4 in cased wells and larger
Complete pump: end, motor and leads
Two-wire needs no control box
Max immersion 984 ft
NSF/ANSI 61 pump end, CSA motor
Best forStandard 4 in residential and light-commercial wells, pressure boosting, garden and agricultural irrigation.
The S4 hydraulic end without a motor, in every nominal flow to 90 GPM. Pair it with a Tesla 4TW or 4GG motor, or any NEMA 4 in motor of matching horsepower, or drop one in to replace a worn end without buying a whole new pump.
Key specifications
1-1/4 in NPT (5–25 GPM); 2 in NPT (35–90 GPM)
Stainless liner, shaft and coupling
Built-in removable non-return valve
Micro-cast AISI 304 supports
NSF/ANSI 61
Best forCustom pump builds, higher-flow agricultural duty, and field repairs where the motor is still good.
A compact 3 in multistage pump with a two-wire AISI 304 stainless motor for narrow-bore wells where a 4 in pump will not fit — a real edge over ranges that start at 4 in. Same sand-resistant technopolymer hydraulics and NSF/ANSI 61 pump end.
Key specifications
3 in cased wells and larger
Two-pole AISI 304 stainless motor
Kingsbury self-centering thrust bearing
Max immersion 490 ft
VFD-ready 30–60 Hz
Best for3 in drilled or driven wells, small-diameter bores, tank and cistern pressurization.
Every DAB well pump series in the U.S. 60 Hz market, on the specs that drive selection. Max flow and max head are family limits per series, not a single duty point.
Series
Diameter
Nominal flow
Max flow
Max head
HP range
Motor / wiring
Form
S3 5
3 in
5 GPM
~18 GPM
538 ft
0.5–1 HP
230V 2-wire
Complete
S3 10
3 in
10 GPM
~18 GPM
~490 ft
0.5–1 HP
230V 2-wire
Complete
S3 15
3 in
15 GPM
~18 GPM
~430 ft
0.5–1 HP
230V 2-wire
Complete
S4 5
4 in
5 GPM
8 GPM
810 ft
0.5–1.5 HP
115/230V, 2 or 3-wire
Complete
S4 7
4 in
7 GPM
11 GPM
673 ft
0.5–1.5 HP
115/230V, 2 or 3-wire
Complete
S4 10
4 in
10 GPM
15 GPM
576 ft
0.5–1.5 HP
115/230V, 2 or 3-wire
Complete
S4 15
4 in
15 GPM
21 GPM
401 ft
0.5–1.5 HP
115/230V, 2 or 3-wire
Complete
S4 20
4 in
20 GPM
30 GPM
321 ft
0.75–1.5 HP
230V, 2 or 3-wire
Complete
S4 25
4 in
25 GPM
35 GPM
299 ft
1–1.5 HP
230V, 2 or 3-wire
Complete
S4 35–90 ends
4 in
35 / 45 / 60 / 90 GPM
to 130 GPM
to ~1500 ft
1–10 HP
NEMA 4 in motor
Pump end
S4 pump ends extend the family to 35, 45, 60 and 90 GPM nominal at higher stage counts and horsepower. Request the DAB curve for the duty point before committing a model.
Performance Data
DAB publishes a maximum flow and a maximum head (at zero flow) for each nominal series. Use these to bracket a selection, then read the actual duty point off the manufacturer curve with margin.
S4 complete pumps: max flow and head by series
Series
5 GPM
7 GPM
10 GPM
15 GPM
20 GPM
25 GPM
Max flow (GPM)
8
11
15
21
30
35
Max head (ft)
810
673
576
401
321
299
Max boost (psi)
351
291
249
174
139
129
S4 pump ends: reach at higher flow
Nominal
35 GPM
45 GPM
60 GPM
90 GPM
Max head (ft)
~1191
~950
~698
~543
HP designed for
1–10
1.5–10
2–10
2–10
Discharge
2 in NPT
2 in NPT
2 in NPT
2 in NPT
Sizing rule of thumb. Total dynamic head equals the pumping water level (static depth + drawdown), plus the pressure-tank setpoint at 2.31 ft per psi, plus friction in the drop pipe and service line. Size the pump to deliver your GPM at that head, and keep the duty point below roughly 70 percent of the series shut-off head for efficient, long-life operation. Worked example: 12 GPM, pumping level 140 ft, 50 psi tank (115 ft), 15 ft friction → ~270 ft TDH → an S4 15 GPM at 1–1.5 HP lands it comfortably below shut-off.
Which DAB Well Pump Do You Need?
A selection guide by application. Call us with your well depth, flow and pressure for an engineering-led selection against the curve.
Application
Typical demand
Recommended model
Notes
3 in drilled or driven well
5–15 GPM
S3 (5/10/15 GPM)
The only option that fits a 3 in casing; 230V two-wire.
Standard 4 in home well
7–15 GPM
S4 7–15 GPM, 0.5–1 HP
Two-wire for the simplest install.
Deep 4 in well / high pressure
5–10 GPM at high TDH
S4 5–10 GPM, 1–1.5 HP
Higher stage count carries the head.
Irrigation / light commercial
20–35 GPM
S4 20–25 GPM complete, or 35 GPM end
Confirm three-phase availability for larger HP.
High-flow agricultural
45–90 GPM
S4 pump end + matched 4 in motor
Build from the components collection.
Tank or cistern boost
5–15 GPM
S3 or S4
Add a float or low-level cutoff.
What Makes These Pumps Different
The engineering shared across the S3 and S4, and why it matters in the well.
Sand Resistant
Technopolymer impellers on stainless steel adjustment rings pass up to 5.42 lb/in³ of sand — a real edge in silty and sandy wells that wear brass and cast iron.
Stainless Hydraulics
Liner, shaft, coupling, integrated suction filter and cable guard in stainless steel, with micro-cast AISI 304 suction and delivery supports.
Water-Filled Tesla Motor
A Kingsbury self-centering thrust bearing cooled and lubricated with a water and glycol mixture, built to carry high axial load over a long service life.
Two Diameters, One Platform
The 3 in S3 and 4 in S4 share hydraulics and certification, so a driller stocks one family for narrow and standard bores alike.
VFD Ready
Every motor runs on a variable frequency drive from 30 to 60 Hz, so the same pump can hold constant pressure on a Tesla or CUE-style drive.
2-Wire or 3-Wire
Two-wire installs with no control box; three-wire adds a matched box for easier field diagnosis and restart.
Built-In Non-Return Valve
A removable technopolymer check valve is integrated in the pump end — no separate inline check to add or fail.
Drinking Water Certified
NSF/ANSI 61 pump end for potable contact, with UL and CSA listed motors.
DAB vs Baker and Grundfos
We carry all three lines, so here is the honest split. Specifications are drawn from our own product listings for each brand; confirm the exact model against the manufacturer booklet.
DAB vs A.Y. McDonald / Baker Water Systems
Specification
DAB S3 / S4
A.Y. McDonald / Baker
Origin
Imported (Italy)
US-built
Well diameters
3 in and 4 in on one platform
4 in, plus 6 / 8 / 10 in pump ends
Flow range
5 to 90 GPM
5 to 80 GPM (4 in); 90 to 1100 GPM (large bore)
Wetted materials
Technopolymer + stainless
No-lead brass, thermoplastic, or stainless (21000–26000 series)
Motor range
To 10 HP (4 in), to 60 HP (6 in)
To 250 HP (10 in)
Availability at WMS
Sold and supported
Authorized, stocked A.Y. McDonald and Baker Water Systems distributor
Where Baker wins: a domestically built pump, a choice of wetted material (silicon bronze for aggressive water, thermoplastic for cost, stainless for durability), the deepest large-diameter range for municipal and agricultural flow, and a line we stock and are authorized on. Where DAB wins: a 3 in option Baker does not offer, sand-resistant technopolymer hydraulics as standard, and a lower price on standard 3 in and 4 in residential wells.
DAB vs Grundfos SP and SQ
Specification
DAB S3 / S4
Grundfos SQ / SP
Origin
Imported (Italy)
Imported (Denmark)
3 in line
S3, 5–15 GPM
SQ, 5–30 GPM (permanent-magnet)
4 in line
S4, 5–90 GPM (with ends)
SP, 5S–77S (10 hydraulic sizes)
Horsepower
0.5 to 10 HP
SQ to ~3 HP; SP 3/4 to 10 HP, 1 & 3-phase
Material
AISI 304 stainless + technopolymer
AISI 304 standard; 316 and 904L options
Positioning
Value, sand-resistant
Premium industrial / groundwater
Where Grundfos wins: a premium pedigree, optional 316 and 904L stainless and special elastomers for corrosive or high-temperature groundwater, a permanent-magnet 3 in SQ, and a broader high-head SP map for demanding waterworks. Where DAB wins: 3 in and 4 in on one platform, the same sand-passing design a tier down on price, and better value on standard residential and irrigation duty. Both are imported stainless pumps — the decision is build tier and budget, not country of origin.
Why Source Your Well Pump From Watermain Supply
Sized Before It Ships
Every pump is checked against your well depth, flow and inlet pressure before it leaves, so what arrives is the model the well needs.
Engineering-Led Sizing
We size from pumping level, tank setpoint and pipe friction against the manufacturer curve, and tell you when a smaller model will do the job.
Multi-Brand Perspective
We also supply A.Y. McDonald / Baker and Grundfos submersibles. If a DAB is not the right fit, we will say so and quote the one that is.
Complete or Component
Buy a complete pump, or a bare end and the motor, control box and cable to your spec — on one order.
Account Terms Available
Net-30 terms for qualified contractor, driller and municipal accounts, handled in-house.
Houston & Gulf Coast Service
Local support and fast fulfillment across the region, with parts and aftermarket backing.
Frequently Asked Questions
Common questions from homeowners, drillers and engineers selecting a submersible well pump.
What is the difference between the DAB S3 and S4?
Both are stainless multistage submersibles on the same sand-resistant platform. The S3 is a 3 in pump for narrow cased wells at 5, 10 and 15 GPM, 0.5 to 1 HP, 230V two-wire. The S4 is the 4 in workhorse: complete pumps from 5 to 25 GPM at 0.5 to 1.5 HP in two-wire or three-wire, and bare pump ends to 90 GPM and 10 HP. Pick the family by well diameter first.
Will an S4 fit my well?
The S4 needs a cased well 4 in or larger. For a 3 in bore, the S3 is the pump that fits, where most competitor 4 in ranges cannot go.
Do I need a control box?
Two-wire models do not; the capacitor and overload are in the motor. Three-wire single-phase models require the matching DAB Tesla control box, listed in the components collection.
115V or 230V?
115V is offered on 0.5 HP only; everything above is 230V single phase, with three-phase on larger pump-end builds. Confirm against your service before ordering.
Can I buy just the pump end?
Yes. S4 pump ends from 5 to 90 GPM let you pair the hydraulic end with the motor you specify, or replace a worn end without a new motor.
Are these safe for drinking water?
The DAB pump ends are NSF/ANSI 61 approved and the Tesla motors are UL and CSA listed.
How does DAB compare to Grundfos?
Grundfos splits the range across two lines, SQ for 3 in and SP for 4 in and 6 in, with optional 316 and 904L stainless and a broader high-head map. DAB keeps 3 in and 4 in on one platform and matches the sand-resistant approach a tier down on price.
How does DAB compare to A.Y. McDonald / Baker?
Baker is US-built with a choice of wetted material, the widest large-diameter range to 1100 GPM, and it is a line we stock and are authorized on. DAB undercuts on price for standard 3 in and 4 in wells and offers a 3 in pump Baker does not.
How deep can they run?
Maximum immersion is 984 ft for the S4 and 490 ft for the S3.
Do they handle sand?
Yes. Technopolymer impellers on stainless adjustment rings pass up to 5.42 lb/in³ of sand, and the motors run on a VFD from 30 to 60 Hz for constant pressure.
Ready to Size Your Well Pump?
Send us your well depth, required GPM and pressure setpoint. We will respond with a sized DAB selection, the motor and control box to match, and lead time — or tell you if Grundfos or Baker is the better fit.
Technical data on this page is taken from DAB Pumps U.S. 60 Hz product literature and A.Y. McDonald and Grundfos product listings, and is subject to change by the manufacturer. Confirm against the current installation manual before specifying.
DAB, Tesla and DAB Water Technology are trademarks of DAB Pumps S.p.A.; Grundfos, SP and SQ are trademarks of Grundfos Holding A/S; A.Y. McDonald and Baker Water Systems are trademarks of A.Y. McDonald Mfg. Co. and Baker Manufacturing Company — all used here for product identification only.
Watermain Supply is a DBA of E4 Industrial LLC, an independent industrial supplier based in Houston, Texas.
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