Slip Coupling 1.cUPC,ACS ,NSF,PATENT approved 2,Market: USA & Canada Europen country 3,1/2" ... /2" 3/4" 1" Certified to cUPC NSF ACS CE PATENT.Connects Copper,PEX and CPVC pipe in any combination.Certified ... years Email: carola @ zjlinbocopper.cn Slip Coupling(cUPC,ACS ,NSF PATENT approved)