prolube 44745 1-inch air operated double diaphragm pump specifically designed with reduced wearing parts for maximum performance; truly non-lubricated design with externally accessible air distribution system. Stall free & ice-free operation: staged exhaust design. The main air valve comprises of a patented carbon (graphite) filled ekonol designed to be non-stalling. Energy saving pump with over 20% lower air consumption over conventional pumps; ideal for waste oil handling (can pass particles over 3mm); fully bolted design: quick tear down & rebuild, hence negligible downtime during operation. Self-priming pump design (incorporating internal check valves) allows for high suction lift even at dry start-up and with heavier fluids; explosion proof design, these do not produce pressure as they have a 1:1 operation & cannot be used with a flow meter; inlet air pressure of 29 100 psi. Air inlet on pump is threaded 3/8″ npt (f); up to 7.66 gpm; max air temperature: 176 f. Recommended fluids: diesel fuel, kerosene, lubricants, gear oil, engine oil, waste oil, brake fluid.