The 200507 AXEON RMH-Series Residential Membrane Housings are made from high–quality polypropylene, which offers chemical resistance. This component will accommodate most standard 12” membrane elements. Both the ribbed cap and the housing are one piece injection molded parts. The ribbed cap incorporates acme square threads and an O-ring to ensure a leakproof seal. Benefits: Test Burst Pressure: 400 psi Single O-ring Design Standard FNPT Molded Threads One Piece Injection Molded Cap and Housing Cycle Test: 150,000 Cycles at 150 psi