A.Y. McDonald 21000 Series J - 5 GPM 4" Silicon Bronze Submersible Pump End, 1/2-1.5 HP
A.Y. McDonald 21000 Series K - 10 GPM Pump End performance curve: total head vs flow by horsepower, Pumps by Baker catalog p. 30
A.Y. McDonald 21000 Series J - 5 GPM 4" Silicon Bronze Submersible Pump End, 1/2-1.5 HP
A.Y. McDonald 21000 Series K - 10 GPM Pump End performance curve: total head vs flow by horsepower, Pumps by Baker catalog p. 30

A.Y. McDonald 21000 Series K - 10 GPM 4 in No-Lead Brass Submersible Pump End

HP: 1/2 HP
Model - Head: 21050K - 171 ft at 10 GPM

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$304.12
SKU: 6650-007
Weight : 7.6 lb
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Description
A.Y. McDonald · Submersible Pump End
21000 Series K - 10 GPM Pump End
No-Lead Brass 4 in pump end for Baker NEMA 4 in motors, 1/2 to 5 HP, 7 models.
171-864 ft at 10 GPM
1/2-5 HP
Fits NEMA 4 in Motors
1331 ft Max Head (Shut-off)
1 1/4 in NPT Discharge
Built-In Check Valve
3 3/4 in Dia x 13.7-37 in L
8-19 lb Weight
What Ships and What It Needs to Run

Included: the 21000 Series K - 10 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 21000 Series K - 10 GPM pump end is the hydraulic end of Baker’s 21000 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.

Baker builds the stack with its captured stack design: sand notches in the diffusers keep sand moving through the pump. Each pump is individually tested after assembly and stamped with the tester’s mark.

This listing covers 1/2 to 5 HP (7 models), all with a 1 1/4 in NPT discharge.

  • Check valve — acetal poppet and seal housing, Buna-N O-ring and stainless steel retention screw; threaded for easy installation or removal; working pressure 400 PSI.
  • Discharge casting and motor bracket — no-lead brass alloy.
  • Discharge bearing — rubber around the stainless steel shaft; self-lubricating, holds shaft alignment.
  • Diffusers — polycarbonate, corrosion and abrasion resistant, built for sand handling.
  • Impellers — glass bead acetal.
  • Shaft — 7/16 in 300 series stainless steel, hex drive, each one measured for straightness.
  • Shell — polished stainless steel, threaded at both ends for field service.
  • Cable guard — stainless steel; angled top keeps the leads in place while the pump is lowered or raised.
  • Motor coupling — stainless steel.
  • Intake screen — non-corrosive.
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 K - 10 GPM class with the matching larger motor. Need more flow? Move to a higher flow class of the 21000 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. 29-30.

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 20–21 GPM

HP 0 GPM (Shut-off) 4 GPM 11 GPM 16 GPM 20 GPM
1/2 HP 259 ft 233 ft 157 ft 87 ft 26 ft
3/4 HP 333 ft 304 ft 207 ft 122 ft 38 ft
1 HP 448 ft 394 ft 288 ft 167 ft 50 ft
1 1/2 HP 591 ft 526 ft 365 ft 209 ft 53 ft
2 HP 758 ft 672 ft 450 ft 257 ft 48 ft
3 HP 1042 ft 904 ft 618 ft 358 ft 113 ft
5 HP 1331 ft 1166 ft 802 ft 454 ft 124 ft

Read from the published curve in the Pumps by Baker catalog (Sept 2025, rev 3/26), p. 30, digitized and rounded down, at the flows nearest 20%, 50% and 75% of the curve’s 21.2 GPM end. 0 GPM is the printed shut-off. 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 100 ft 150 ft 200 ft 250 ft 300 ft
1/2 HP 15.77 14.09 10.28 5.44 — — —
3/4 HP 17.20 15.97 13.28 10.21 6.54 1.61 —
1 HP 18.56 17.68 15.82 13.81 11.59 9.10 6.18
1 1/2 HP — 18.46 17.15 15.76 14.29 12.72 11.01
2 HP — 18.51 17.49 16.44 15.35 14.21 13.02
3 HP — 19.97 19.17 18.35 17.51 16.65 15.77
5 HP — 20.17 19.59 18.99 18.39 17.77 17.14

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

HP 25 ft 50 ft 100 ft 150 ft 200 ft 250 ft 300 ft
1/2 HP 12.56 10.60 5.87 — — — —
3/4 HP 14.86 13.49 10.46 6.85 2.07 — —
1 HP 16.91 15.97 13.97 11.77 9.30 6.42 2.83
1 1/2 HP — 17.25 15.87 14.41 12.84 11.15 9.29
2 HP — 17.57 16.52 15.44 14.30 13.11 11.87
3 HP — 19.23 18.41 17.58 16.72 15.84 14.94
5 HP — 19.63 19.04 18.43 17.82 17.19 16.54

Output tables as printed in the Pumps by Baker catalog (Sept 2025, rev 3/26), pp. 29-30, 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
3 HP 3-wire 3132-512 · 3Ph 3132-514
5 HP 3-wire 3132-513 · 3Ph 3132-517

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
Check valve Acetal poppet and seal housing, Buna-N O-ring and stainless steel retention screw; threaded for easy installation or removal; working pressure 400 PSI
Discharge casting and motor bracket No-lead brass alloy
Discharge bearing Rubber around the stainless steel shaft; self-lubricating, holds shaft alignment
Diffusers Polycarbonate, corrosion and abrasion resistant, built for sand handling
Impellers Glass bead acetal
Shaft 7/16 in 300 series stainless steel, hex drive, each one measured for straightness
Shell Polished stainless steel, threaded at both ends for field service
Cable guard Stainless steel; angled top keeps the leads in place while the pump is lowered or raised
Motor coupling Stainless steel
Intake screen Non-corrosive

Source: Pumps by Baker catalog (Sept 2025, rev 3/26), pp. 23-24.

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 21000 Series Guide
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