DIAPHRAGM PUMPS. Diaphragm pumps are self-priming and do not require pumped liquid for lubrication. They can run dry, liquid can be lifted 6 feet with no external check valves. PAR-MAX 4: Four chamber diaphragm, and up to 4 outlets. Provides 4.3 GPM. Ports are 1/2รถ threaded.
