Mission Rubber 1804020 No-hub Coupling 4 X 2 Inches

Product Description

The MISSION RUBBER 1804020 is a standard lightweight no-hub coupling designed to join cast iron drain, waste, and vent pipe without hub connections. It uses a stainless steel shield and band clamp assembly to compress a neoprene sleeve against the pipe ends, creating a leak-resistant seal. At a nominal 4 x 2 inches, this reducer coupling connects pipes of two different diameters in a single fitting. Plumbers and pipefitters install this type of coupling in DWV systems during new construction, renovation, and repair work.

This coupling is suited for residential and light commercial drain, waste, and vent piping systems where a hubless connection is required. The reducer configuration handles transitions from 4-inch to 2-inch nominal cast iron pipe ends. It is commonly used when connecting branch lines, reducing stack sizes, or adapting between pipe segments in a no-hub cast iron system. The domestic designation indicates it is manufactured in the United States.

Key Features

• Reducer coupling joins 4-inch nominal pipe to 2-inch nominal pipe in one fitting
• No-hub design eliminates the need for leaded or caulked joints
• Cast iron end style compatible with standard no-hub cast iron DWV pipe
• Lightweight standard series for typical residential and light commercial DWV applications
• Domestically manufactured fitting

Compatibility

Designed as an OEM-style replacement coupling for standard no-hub cast iron DWV piping systems with 4 x 2 inch nominal pipe ends.

Installation Notes

Installation is performed by licensed plumbers following applicable plumbing codes such as the IPC or local adopted standards. Ensure all pipe ends are clean, deburred, and properly aligned before seating the neoprene sleeve and positioning the stainless steel shield. Torque band clamps evenly per the coupling manufacturer specifications printed on the product label. Always confirm the system is depressurized and drained before removing or replacing any coupling in an active DWV line.

Technical Specifications

• Nominal Size: 4 x 2 inches
• End Style: Cast Iron
• Series: Standard Lightweight
• Connection Type: No-Hub
• Country of Origin: Domestic (USA)

Standard Information

• Brand: MISSION RUBBER
• Manufacturer Part Number: 1804020