Fernco 1056-43 4x Flexible Pvc Reducer Coupling

Product Description

The FERNCO 1056-43 4x is a flexible PVC clamp reducer coupling designed to transition between 4-inch and 3-inch pipes. It forms a leak-proof seal using a pliable PVC shear ring and stainless steel clamps that draw tight around the pipe ends. Plumbers and drain technicians use this type of coupling to connect dissimilar pipe materials without solvent weld or threaded fittings. The part number, pipe size, and compatible pipe materials are clearly marked on the coupling body for fast field identification. This reducer coupling is a standard solution for residential and light commercial drain, waste, and vent work.

This coupling is suited for drain, waste, and vent (DWV) applications where a 4-inch line reduces to a 3-inch line, or where two pipes of different materials need to be joined in a single fitting. Typical install scenarios include tie-ins at stack transitions, stub-out repairs, and service replacements where cast iron, PVC, ABS, or clay pipe ends must be connected without rigid fittings. The flexible sleeve accommodates slight pipe misalignment and out-of-round pipe ends that rigid couplings cannot handle.

Key Features

• Transitions between 4-inch and 3-inch pipe in a single fitting
• Flexible PVC sleeve seats over pipe ends without solvent weld or threading
• Stainless steel clamp bands provide secure, corrosion-resistant clamping
• Accommodates slight pipe misalignment and out-of-round pipe ends
• Part number, size, and compatible pipe material markings molded onto coupling body
• Compatible with a broad range of pipe materials including cast iron, PVC, ABS, and clay

Compatibility

Designed as an OEM-style flexible reducer coupling for 4-inch to 3-inch DWV pipe transitions across multiple pipe materials.

Installation Notes

Installation is performed by licensed plumbers or qualified drain technicians working under applicable plumbing codes such as the IPC or UPC. Shut off flow and ensure the pipe ends are clean, deburred, and free of debris before seating the coupling. Tighten clamp bands evenly and to the torque range indicated on the coupling or manufacturer documentation. Inspect the joint for leaks after restoring flow.

Technical Specifications

• Pipe Size (Inlet): 4 inches
• Pipe Size (Outlet): 3 inches
• Material: Flexible PVC with stainless steel clamp bands
• Case Pack Quantity: 40 units
• Overall Case Dimensions: 18.375 inches x 16.375 inches x 16.625 inches

Standard Information

• Brand: FERNCO
• Manufacturer Part Number: 1056-43 4x