Balcrank 1" Pneumatic Diaphragm Pump with an aluminum design is a 1:1 air-operated pump with 1" NPT(F) fluid inlet and outlet ports. This U/L-listed, air-operated pump includes acetal ball checks, buna diaphragms, and aluminum seats, offering a 1:1 pressure ratio, free flow of 35 gpm, and operating at a max air pressure of 50 PSI. This pump is ideal for use with waste oil in areas that require a U/L-labeled pump.