Slip Coupling 1.cUPC,ACS ,NSF,PATENT approved 2,Market: USA & Canada Europen country 3,1/2" 3/ ... .Certified to 200psi (13.8bar ) and 200°F (93 °C) Approved for use underground and behind walls without access panels.Certified ... Email: carola @ zjlinbocopper.cn Slip Coupling(cUPC,ACS ,NSF PATENT approved)