1/2" Female Sweat X 1/2" Barb Adapter Coupling Is For Pex Plumbing And Heating Systems. It Is Made From Forged Brass Which Is 15% Stronger Than Brass Counterparts And Are Free Of Imperfections. This Coupling Is High Quality As It Is Certified By The Canadian Standard For Pex Pipe And Fittings, As It Has Passed Pressure Testing At Three Temperatures. It Has A Maximum Working Pressure Of 690Kpa.