APXC3410PK 3/4" PEX BARB COUPLING BRASS 10PK | ApolloPEX lead-free dezincification-resistant brass couplings are the premier low cost solution for connections within a PEX piping system. ApolloPEX fittings are suitable for both potable water and hydronic heating systems. ApolloPEX fittings may be used with copper crimp rings, stainless steel pinch clamps or stainless steel crimp sleeve (all sold separately).