MIFAB® Series MI-HUB-ARC shielded repair couplings are manufactured with gaskets made from neoprene compound that meets the requirements of ASTM C-564 housed inside a Type 300 stainless steel shield. Two Type 300 stainless steel clamps tightened with 5/16" Type 300 stainless steel hex head screws surround the shield to provide the sealing force. The MI-HUB-ARC Series of shielded repair couplings are tested and certified to ASTM Standard 1173-2010 and CSA Standard B602-2016 and listed with I.A.P.M.O. All models are listed to the National Plumbing Code of Canada and relevant Canadian Standard(s) and bear the cUPC mark of conformity. Non constant temperature rating is 140 F.