Fernco Inc P1059-44 Flexible Coupling 4 Inches

Product Description

The FERNCO INC P1059-44 is a 4-inch flexible coupling designed for socket-to-pipe drain and waste connections. It bridges misaligned, offset, or dissimilar pipe ends using a resilient elastomeric sleeve that conforms to slight variations in pipe diameter and alignment. Plumbers and pipefitters install this coupling in residential and light commercial drain, waste, and vent systems where a rigid coupling would crack or leak under ground movement, vibration, or thermal expansion. The sleeve compresses evenly against both pipe ends to create a watertight, root-resistant seal without special tools or adhesives.

This coupling is suited for below-grade, in-wall, and exposed drain and waste piping applications. The socket-to-pipe configuration makes it a practical choice when connecting a hub-end fitting to a plain-end pipe segment. It is used in new construction tie-ins, repair work, and retrofit situations where cutting in a rigid fitting is not practical. A single unit ships per each; the supplier packages this item 20 units per case.

Key Features

• 4-inch socket-to-pipe configuration accommodates hub-end to plain-end connections
• Flexible elastomeric sleeve absorbs vibration, thermal movement, and minor misalignment
• No solvent cement, heat, or special tooling required for installation
• Watertight seal resists root intrusion and ground shifting
• Sold individually; available in case quantities of 20

Compatibility

Designed as an OEM-style flexible coupling replacement for 4-inch drain, waste, and vent piping systems where a socket-to-pipe transition is required.

Installation Notes

Installation is performed by licensed plumbers in accordance with local plumbing codes and the International Plumbing Code (IPC). Shut off flow and relieve any system pressure before cutting into an existing drain line. Ensure both pipe ends are clean, deburred, and free of grease before seating the coupling sleeve. Follow the manufacturer torque sequence for stainless clamp bands to achieve an even, leak-free seal.