Fernco 66u-401 Donut Coupling 6x4 in Ci Hub Sdr 35 Pvc

Product Description

The FERNCO 66u-401 is a flexible donut-style service coupling designed to connect a 6-inch cast iron hub to a 4-inch SDR 35 PVC pipe. This fitting bridges two common pipe materials and sizes at transition points in drainage systems, making it a practical solution where cast iron and PVC meet. The flexible elastomeric construction compensates for minor misalignment and provides a watertight seal without hot-lead caulking or special tools. At 2.86 pounds, it is compact enough for tight access areas. Licensed plumbers and drain contractors install this fitting during repair, rehabilitation, or new rough-in work on sanitary drain, waste, and vent systems.

The 66u-401 is suited for residential and light commercial plumbing applications where a cast iron hub transition to SDR 35 PVC piping is required. Typical scenarios include sewer lateral repairs, stack base transitions, and tie-ins where existing cast iron infrastructure meets newer PVC drain lines. The donut profile seats inside the cast iron hub bell, allowing the PVC pipe to pass through and seal without cutting into the existing hub.

Key Features

• Connects 6-inch cast iron hub to 4-inch SDR 35 PVC pipe in a single fitting
• Flexible elastomeric donut construction compensates for minor pipe misalignment
• No hot-lead caulking, flame, or specialized joining equipment required
• Lightweight at 2.86 pounds for easier handling in confined spaces
• Watertight seal suitable for sanitary drain, waste, and vent applications

Compatibility

Designed as an OEM-style flexible transition fitting for 6-inch cast iron hub connections to 4-inch SDR 35 PVC pipe in sanitary drainage systems.

Installation Notes

Installation is performed by a licensed plumber. Shut off flow and isolate the line segment before beginning work. The donut coupling seats into the cast iron hub bell; ensure the hub interior is clean and free of debris or sharp edges before seating the fitting. Follow local plumbing codes, including applicable IPC or local jurisdictional requirements, for approved transition methods on sanitary drain systems.

Technical Specifications

• Fitting Size: 6 inches x 4 inches
• Item Weight: 2.86 pounds
• Connection Type: Cast Iron Hub x SDR 35 PVC

Standard Information

• Brand: FERNCO
• Manufacturer Part Number: 66u-401