A.Y. McDonald 22100V Thermoplastic Well Pump End Only 7 GPM 1.0 HPA. Y. McDonald offers a full line of four inch submersibles ranging from 1 2 through 1 1 2 horsepower (HP), with flow rates ranging from 5 through 25 gallons per minute (GPM). The 22000 Series submersibles offer peak capacity performance in 5, 7, 10, 15, 20, and 25 GPM models. All V Series Thermoplastic Pumps have a 1 1 4" discharge with internal check valve and sizes ranging from 1 2 to 1 1 2 horsepower (HP). Two or three wire models up to 1 1 2