IDEX practical Replacement Back Pressure Regulator (BPR) Cartridge operates as an easy to use, replaceable component for IDEX BPR systems. It is constructed from PEEK, Tefzel (EFTE), and has a gold plated stainless steel spring delivering reliable usage. IDEX specialized cartridge can be easily used with any of IDEX durable standard BRP Holders and creates a back pressure of 500 psi (34 bar). It comes with a tan body and green cap.