MIFAB® Series MI-ELB of flexible rubber elbow couplings are manufactured from a flexible PVC that meets the requirements of ASTM C-564 and Type 300 Series of stainless steel clamps tightened (to 60 lbs. torque) with 5/16” Type 300 stainless steel hex head screws. The MI-ELB Series of flexible couplings are listed with I.A.P.M.O. Non constant temperature rating is 140 F.