Silicon bronze discharge casting and motor bracket around a polished stainless shell — bronze toughness exactly where the pump end takes its mechanical stress when setting, pulling, and threading pipe. Glass bead acetal impellers ride polycarbonate diffusers with the captured-stack sand notches, on a 7/16" 300-series stainless hex shaft individually checked for straightness. Flow classes 5 through 25 GPM, matched to motors from 1/2 to 5 HP.

The value pair: reinforced thermoplastic brackets and discharge with stainless shell and shaft underneath. The 22000 matches motors from 1/2 to 1 1/2 HP — the classic budget residential swap. The 25000 runs the same construction philosophy with reach to 2 HP, the answer when the well needs a half-horsepower more than the 22000 offers without stepping up to stainless pricing.

The 23000 is the service-oriented stainless build: heavy shell threaded at both ends, easy-wrench stainless discharge with built-in safety eye, and the Diamond Design easy-out check valve — everything aimed at a pump end you can open in the field. The 24000 is the volume stainless platform, the most common like-for-like replacement in the catalog. Both run 5–25 GPM classes against motors from 1/2 to 5 HP.

The only Baker series where the hydraulics themselves are stainless: high-efficiency stainless steel impellers and diffusers, a 431 stainless shaft, 304 stainless on every other metal part, stainless suction screen, and a stainless discharge head with built-in check valve. Flow classes at 5, 10, 18, 25, 40, and 70 GPM against motors from 1/2 to 10 HP. Rated for clean, non-corrosive, non-abrasive liquids to 140°F — this is the corrosion answer, not the sand answer.