Mission Rubber 804351 Twc Specialty Coupling 4 in

Product Description

The MISSION RUBBER 804351 is a TWC specialty coupling designed to join dissimilar pipe materials in drain, waste, and vent (DWV) systems. It connects thinwall plastic pipe to cast iron pipe at a 4-inch nominal size, providing a reliable transition where two different pipe end styles meet. This type of no-hub coupling is typically installed by licensed plumbers during new construction, renovation, or repair work on residential and light commercial DWV systems. The stainless steel band and neoprene sleeve construction creates a leak-resistant, mechanically secure joint without the need for solvent cement or hot-work.

This coupling is suited for underground, in-wall, and exposed DWV piping applications where a thinwall plastic pipe section must tie into an existing or new cast iron run. It is commonly used during bathroom additions, drain line repairs, and system retrofits where mixed pipe materials are present. The domestic designation indicates it is manufactured to domestic production standards, which is often required on public works and government projects.

Key Features

• Transitions thinwall plastic pipe to cast iron pipe at 4-inch nominal size
• TWC end style accommodates differing outside diameters between pipe materials
• No-hub design eliminates the need for soldering, cementing, or hot-work during installation
• Domestic manufacture, suitable for projects with domestic-content requirements
• Neoprene sleeve provides a flexible, leak-resistant seal between dissimilar materials

Compatibility

Designed as an OEM-style specialty transition coupling for 4-inch nominal DWV systems where thinwall plastic pipe connects to cast iron pipe ends.

Installation Notes

Installation should be performed by a licensed plumber in accordance with the International Plumbing Code (IPC) and applicable local codes. Shut off flow and drain the line before removing any existing fittings. Ensure pipe ends are clean, deburred, and properly aligned before tightening the band clamps evenly to the torque range specified on the coupling packaging. Do not overtighten, as this can deform the neoprene sleeve and compromise the seal.

Technical Specifications

• Nominal Size: 4 inches
• End Style: Thinwall Plastic x Cast Iron
• Coupling Type: TWC Specialty
• Origin: Domestic

Standard Information

• Brand: MISSION RUBBER
• Manufacturer Part Number: 804351