MIFAB® Series MI-QHUB (specify size) no hub couplings are manufactured with Quick Hub gaskets made with neoprene that meets the requirements of ASTM C-564 housed inside a Type 301 stainless steel corrugated shield. Two (2 through 4 in size), four (6 through 10 in size) or six (12 in sizes) Type 301 stainless steel clamps tightened with 5/16 in Type 305 stainless steel hex head screws surround the shield to provide the sealing force. MI-QHUB Series Couplings are tested and certified to the ASTM-C1277-2009a, CISPI 310-2010, and CSA B602-2010 (File # 247608) Standards and are listed with IAPMO. Also tested and certified by Intertek Testing Services to CAN/ULC S102.2-07 ''Smoke Test.'' Patented Pipe Clamp for joining all types of pipe.