Fernco® Flexible Repair Coupling, Strong Back, 1006 RC Series, Fitting/Connector Type: Coupling, 4 in Nominal Size, Concrete x Cast Iron/Plastic, 3.97 in Length, 4.3 psi Tested, Flexible PVC, -30 to 140 deg F, 6.22 in OD
Designed for resistance to heavy earth loads and shear forces, while providing improved pipe alignment.