MIFAB® MI-FLEX-CC Series of flexible rubber couplings are manufactured from an elastomeric compound that meets the requirements of ASTM C-564 and 300 Series of stainless steel clamps tightened with 5/16" Type 300 stainless steel hex head screws. The MI-FLEX-CC Series of flexible couplings are tested and certified to ASTM Standard 1173-2010 and CSA Standard B602-2010 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.