This 3 in. x 3 in. IDEAL-TRIDON Classic No-Hub Coupling is engineered to connect no-hub cast iron pipe and fittings. The coupling sleeve or gasket is manufactured from a properly vulcanized virgin compound where the primary elastomer is Neoprene. The gasket is housed inside a 300 series stainless steel corrugated shield. The Ideal-Tridon No-Hub gasket features multiple sealing beads under the clamp bands which impede the movement of the gasket and pipe, providing superior sealing pressure and holding power.