Fernco 1056-315 1056-315 3-in.x1.5-in. Flexible PVC Clamp Clamp Reducer Coupling - Black 1056-315

The Fernco 1056-315 is a reducing coupling that joins 3 inch pipe on one end to 1-1/2 inch pipe on the other. It is a flexible rubber sleeve with a stainless clamp on each end, so the transition is made without solvent welding or threading.

That is exactly what the 1056-315 does. The 3 inch end goes over the drain line and the 1-1/2 inch end takes the smaller branch, and the two clamps are tightened to seal. It is a drain, waste and vent fitting, not a pressure fitting, so keep it on non-pressure gravity drainage.

The rubber sleeve grips the outside diameter of the pipe rather than bonding to it, so it will mate 3 inch and 1-1/2 inch pipe of dissimilar materials as long as the outside diameters match those nominal sizes. That is the usual reason to reach for a flexible coupling instead of a solvent weld reducer: cast iron to plastic, or old to new, in one joint.

The clamps come on the coupling, one at each end. All you need on site is a nut driver or torque wrench for the clamp screws and clean, square-cut pipe ends. No primer, cement or threading.

Use the rigid reducer when both sides are PVC, the alignment is clean and the joint will be buried or inaccessible. Use a flexible coupling like the 1056-315 when the materials differ, the pipe ends are not perfectly aligned, or you want the joint to come apart later. Flexible couplings also absorb minor movement, which rigid solvent joints do not.

Order Fernco 1056-315. That is the manufacturer part number for the black 3 inch by 1-1/2 inch flexible PVC clamp-to-clamp reducer, and it is the single model on the item.