... couplings 1.Mateiral:304,316. 2.Process:investment casting. 3.Certification:ISO9001. 1/2"-6" stainless steel quick couplings. ... us your detail requirements. Size1/2”,3/4”, 1”, 1 1/4”,1 1/2”,2”,2 1/2”,3”,4”,5”, 6” ... ,DC,DPCasting ProcessInvestment-CastingSurface TreatmentStain & Mirror PolishAdvantages1) High-quality raw materials imported from Australia 2) Advanced production lines, high technology ...