Fox Foundry 4 Inchesxh No Hub Heavy Duty Coupling 4 Inch

Product Description

The FOX FOUNDRY 4"xh is a heavy duty no hub coupling designed for joining cast iron, plastic, or other drain, waste, and vent pipe in residential and commercial plumbing systems. Built from stainless steel, this coupling provides a strong, corrosion-resistant connection without requiring threaded or hubbed fittings. With a 4-inch nominal pipe diameter and a sleeve length of 3-1/16 inches, it is sized for standard 4-inch no hub pipe joints. Licensed plumbers and pipefitters install this type of coupling where rigid, leak-resistant connections are required in DWV systems.

This coupling is suited for use in drain, waste, and vent applications where no hub pipe joining methods are specified. It is appropriate for underground, in-wall, and exposed installations depending on local code requirements. The heavy duty designation indicates reinforced construction intended for higher-stress installations such as commercial buildings, multi-family residential, or below-slab applications where standard couplings may not meet load or durability requirements.

Key Features

• Heavy duty stainless steel construction for corrosion resistance in wet environments
• No hub design eliminates need for threaded or hubbed pipe connections
• 4-inch nominal size fits standard 4-inch DWV pipe
• 3-1/16 inch sleeve length provides adequate sealing surface at the joint
• Compact profile suitable for tight installation spaces

Compatibility

Designed as an OEM-style replacement or standard service fitting for 4-inch no hub drain, waste, and vent piping systems where heavy duty couplings are required.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and the International Plumbing Code (IPC). Shut off water flow and verify the pipe is depressurized before beginning work. Torque the coupling bands evenly using a torque-limiting driver to the tool or manufacturer specification indicated on the coupling itself. Do not overtighten, as stainless steel bands can deform the neoprene sleeve and compromise the seal.