... .Medium:water,oil,gas. 3.Certification:CE. Durable Forged Brass Check Valve.1.Model No. : LDM-CV042.Material: Body Brass,Hpb57-3 ... , CuZn39pb3,,CuZn40pb2,CW3770,DZR. Stem Brass Stem, Brass as above. Sealing PTFE/TEFLON,VITON,O-RINGS. Handle Iron handle,Stainless steel ...