The Procon Pump NSF Brass 125 GPH 3/8" NPT - 250 psi PRV w/ .188" Double Flat Drive (Clamp-on) rotary vane pump is a positive displacement pump. This Series 1 Procon pump is brass with a .188" double flat drive. The inlet and outlet ports are 3/8" NPT, with an integral strainer, and the pump has a flowrate of 125 gallons per hour. The seal configuration for the 111A125F11AA250 uses Nitrile Type 21 which will prevent leakage. The clockwise rotation of the pump operates at a nominal speed of 1725 rotations per minute. The Series 1 pumps are self-priming, so there is virtually no maintenance. The pressure relief valve for this pump is set for 250 PSI. The 111A125F11AA250 pump is designed to be directly connected to the motor with a stainless-steel clamp.