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Featuring Blue-White's CHEM-FEED C-1500N Exclusive Heavy Duty Cartridge Valve Head. The revolutionary design of this pump head begins with BULLET Cartridge Valves constructed of tough PVDF Plastic. Each Valve has two Ceramic Ball Checks and, is double sealed with high grade Aflas o-rings. The double ball valve pump head design ensures enhanced priming capabilities, and it is exceptional for purging air and gas.