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03:38 PM
Included: the 21000 Series J - 5 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.
The 21000 Series J - 5 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 1 1/2 HP (4 models), all with a 1 1/4 in NPT discharge.
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.
One pump end per motor. Need more head later? Step up in horsepower within the J - 5 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.
| 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. 25-26.
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 12–12.5 GPM
| HP | 0 GPM (Shut-off) | 3 GPM | 6 GPM | 9 GPM | 12 GPM |
|---|---|---|---|---|---|
| 1/2 HP | 361 ft | 298 ft | 223 ft | 131 ft | 19 ft |
| 3/4 HP | 512 ft | 435 ft | 324 ft | 184 ft | 32 ft |
| 1 HP | 649 ft | 542 ft | 392 ft | 214 ft | 28 ft |
| 1 1/2 HP | 829 ft | 702 ft | 510 ft | 274 ft | 44 ft |
Read from the published curve in the Pumps by Baker catalog (Sept 2025, rev 3/26), p. 26, digitized and rounded down, at the flows nearest 20%, 50% and 75% of the curve’s 12.6 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 | 50 ft | 100 ft | 150 ft | 200 ft | 250 ft | 300 ft | 350 ft |
|---|---|---|---|---|---|---|---|
| 1/2 HP | 9.2 | 7.8 | 6.1 | 4.3 | 2.1 | — | — |
| 3/4 HP | 10.3 | 9.3 | 8.3 | 7.2 | 6.1 | 4.9 | 3.5 |
| 1 HP | 10.6 | 9.8 | 9.0 | 8.1 | 7.3 | 6.4 | 5.5 |
| 1 1/2 HP | 11.1 | 10.4 | 9.7 | 9.1 | 8.5 | 7.8 | 7.2 |
Output in GPM at 50 PSI (switch cut-out), by depth to water
| HP | 50 ft | 100 ft | 150 ft | 200 ft | 250 ft | 300 ft | 350 ft |
|---|---|---|---|---|---|---|---|
| 1/2 HP | 7.9 | 6.3 | 4.4 | 2.3 | — | — | — |
| 3/4 HP | 9.4 | 8.3 | 7.3 | 6.2 | 4.9 | 3.6 | 2.0 |
| 1 HP | 9.9 | 9.0 | 8.2 | 7.3 | 6.4 | 5.5 | 4.6 |
| 1 1/2 HP | 10.5 | 9.8 | 9.1 | 8.5 | 7.9 | 7.2 | 6.6 |
Output tables as printed in the Pumps by Baker catalog (Sept 2025, rev 3/26), pp. 25-26, 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 |
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.
| 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 |
| 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.
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