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MIFAB® Series MI-QHUB (specify size) no-hub couplings are manufactured with quick-hub gaskets made with neoprene and three sealing rings that meets the requirements of ASTM C564 housed inside a type 301 stainless steel corrugated shield. Two-(2 in through 4 in size), four (6 in 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, CISPI 310, NSF, CSA B70 and CSA B602 (file no. 247608) standards and are listed with IAPMO. Also tested and certified by Intertek testing services to CAN/ULC S102.2 smoke test. Patented pipe clamp for joining all types of pipe.