Midland Industries 970822 Reducing No-hub Coupling 4x3 in

Product Description

The MIDLAND INDUSTRIES 970822 is a reducing no-hub coupling designed to connect cast iron, plastic, or other drain, waste, and vent (DWV) pipe sections of different diameters in a single joint. It transitions from a 4-inch hub to a 3-inch hub using a rubber sleeve and a 316 stainless steel band and clamp system. Rated to 4.3 psi and suitable for service temperatures from -30 degrees F to 140 degrees F, it provides a secure, leak-resistant connection in below-grade, in-wall, and exposed drain piping installations. Licensed plumbers install this fitting as part of new construction or repair work on DWV systems.

This coupling is used in residential and light commercial plumbing applications where a no-hub drain line must step down from a 4-inch main to a 3-inch branch or stub-out. It is suited for horizontal, vertical, and offset runs within DWV systems. The no-hub connection style eliminates the need for solvent cement or lead-and-oakum joints, making it a common choice for repair and retrofit work where speed and code compliance both matter.

Key Features

• Reduces from 4-inch to 3-inch no-hub pipe in a single coupling
• 316 stainless steel band resists corrosion in wet and below-grade environments
• Rubber sleeve conforms to pipe OD and absorbs minor misalignment
• Rated to 4.3 psi service pressure
• Operating range of -30 degrees F to 140 degrees F covers typical DWV service conditions
• Standard installation torque of 60 inch-pounds for consistent clamp seating

Compatibility

Designed as an OEM-style no-hub reducing coupling for residential and commercial DWV drain, waste, and vent piping systems using 4-inch and 3-inch no-hub pipe connections.

Installation Notes

Installation is performed by a licensed plumber in accordance with local plumbing codes and the International Plumbing Code (IPC). Shut off flow and drain the line before removing any existing coupling or pipe section. Torque the stainless steel clamp bands to the manufacturer-specified value using a torque-controlled screwdriver or nutdriver to avoid over-tightening the rubber sleeve. Inspect pipe ends for burrs, cracks, or debris before seating the coupling to ensure a proper seal.