... 3) accordance with German Standard DIN8077-80784) CE certification5) The product safe for drinking water test report6) Brass insert ... Dovetail groove struction,it is strong than other factory8) the material is Korea Import material,we don't use ... materialOur Donsen factory supply PPR pipes and fittings,PPR pipes,PPR fittings and PPR pipe fittings,PP compression fittings,PPR moulds,Accept OEM services ...