Mission Rubber MR56 33 Arc Wd 3 Inch Calder Coupling

Product Description

The MISSION RUBBER MR56 33 ARC WD is a 3-inch Strong Back Calder coupling designed to join plastic or cast iron pipe to plastic or cast iron pipe in drain, waste, and vent (DWV) systems. The Strong Back design adds a rigid external band that reinforces the coupling body, resisting distortion under clamp load and providing a more secure, leak-resistant seal. This coupling is installed by licensed plumbers during new construction, renovation, or repair work where a no-hub style transition connection is required.

This coupling is suited for residential and light commercial plumbing applications involving 3-inch DWV piping. It is used in scenarios where a field technician needs to connect dissimilar pipe materials — plastic to cast iron or same-material joints — without solvent welding or mechanical threading. The Calder coupling format is a recognized approach for no-hub pipe joining in underground and above-ground drain and waste systems.

Key Features

• Strong Back reinforcing band resists coupling body distortion under torque load
• Accepts plastic or cast iron pipe on both ends for flexible material transitions
• 3-inch nominal pipe size fits standard DWV drain and waste lines
• No-hub style installation — no threading or solvent welding required
• Order increment of 1 — available as a single unit

Compatibility

Designed as an OEM-style no-hub coupling for 3-inch plastic or cast iron DWV pipe systems in residential and commercial plumbing installations.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and the International Plumbing Code (IPC). Shut off flow and drain the line segment before beginning work. Use a calibrated torque wrench to tighten the stainless steel clamp bands to the coupling manufacturer's specification — do not over-tighten, as this can damage the elastomeric sleeve. Inspect the pipe ends for burrs or debris and clean them before seating the coupling.

Technical Specifications

• Nominal Pipe Size: 3 inches
• Connection Type: Plastic or Cast Iron x Plastic or Cast Iron (No-Hub Calder Style)
• Coupling Style: Strong Back
• Weight: 1.05 pounds
• UPC: 70288705760

Standard Information

• Brand: MISSION RUBBER
• Manufacturer Part Number: MR56 33 ARC WD