Protek hand primer pumps provide fast efficient priming of pump with high suction lift or extra long suction lines. They can be used in a wide range of installations such as fountains, swimming pools and irrigation systems. THE DIAPHRAGM PRIMER contains a rubber diaphragm working in an aluminum chamber. A levered handle attached to it by a connecting rod actuates the diaphragm. Air is drawn into the chamber through a suction valve on the up-stroke and discharged through a discharge valve on the down-stroke. The primer body is made of a light weight aluminum alloy. The diaphragm is of molded rubber, and it is extremely tough and long wearing. A rubber air discharge valve, built into the diaphragm, provides a positive seal. Always made in the USA