Heavy-Duty no-hub Pipe Couplings can be used to assemble no-hub pipe and fittings manufactured per ASTM A 888. The couplings consist of a gasket made of an elastomeric compound enclosed in a corrugated pattern stainless steel shield. Depending on the size of the shield, 4 or 6 clamps are provided to give the required sealing force to the shield to seal the gasket on the pipes and fittings. Marking, certification, standards: