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The housing is brass alloy #360, buffed and nickel-chrome plated per ASTM B456-SC-2. All threads conform to industry standards for plumbing and piping applications: 15/16-27NS-2A and 55/64-27NS-2B. The elastomeric flow control is ethylene propylene, 70 durometer. The perforated plates are 70/30 brass alloy sheet per ASTM-B-36-61, 0.016 thick with perforations per manufacturer. Screens are series 300 stainless steel, 40 mesh. The cartridge housing and spacers are celcon, type M-90-04, injection molded.