Ideal Industries 6231m8g No-hub Coupling 12 Inches

Product Description

The IDEAL INDUSTRIES 6231m8g is a standard no-hub coupling designed to join 12-inch no-hub cast iron pipe in drain, waste, and vent (DWV) systems. The one-piece 304 stainless steel shield housing eliminates the leak paths that can develop in stacked or welded clamp designs. Six stainless steel clamp bands secure the ASTM C564 vulcanized compound gasket to both pipe ends, creating a reliable, low-profile joint. This coupling meets CISPI 310, IAPMO, and NSF standards, making it code-acceptable for residential and commercial plumbing rough-in work where structural reinforcement of the joint is not required.

The 6231m8g is suited for straight in-line connections in 12-inch no-hub cast iron DWV piping systems. It is commonly installed in below-grade, above-grade, and in-wall drain and waste lines in commercial buildings, multi-family residential construction, and institutional facilities. This coupling is a cost-effective alternative in applications where the joint does not bear structural load and where the installer needs a straightforward, gasket-included solution that meets applicable plumbing codes.

Key Features

• One-piece shield housing eliminates leak paths found in stacked or welded clamp assemblies
• 304 stainless steel shield, band, and screw material for corrosion resistance
• Includes ASTM C564 vulcanized compound gasket — no separate gasket purchase required
• Six-clamp design provides evenly distributed clamping force across the 5.5-inch coupling width
• Meets CISPI 310, IAPMO, and NSF standards for code-compliant DWV installations
• ASTM C1277 material specification compliance

Compatibility

Designed for straight no-hub x no-hub connections on 12-inch cast iron DWV pipe conforming to CISPI 310 and ASTM C1277 specifications. Suitable for applications where structural joint reinforcement is not required.

Installation Notes

Installation is performed by licensed plumbers working under applicable local plumbing codes, including IPC and IAPMO standards. Shut off flow and verify the pipe is properly supported before making the joint. The manufacturer specifies an installation torque rating of 120 inch-pounds per clamp — use a calibrated torque screwdriver or torque wrench to avoid over-tightening, which can damage the gasket or shield. Do not substitute the supplied gasket with non-rated material, as gasket integrity is critical to a leak-free no-hub joint.

Technical Specifications

• Fitting Type: Straight No-Hub Coupling
• Size A: 12 inches
• Size B: 12 inches
• End Connection: No Hub x No Hub
• Coupling Width: 5.5 inches
• Shield Thickness: 0.008 inches
• Number of Clamps: 6
• Installation Torque Rating: 120 inch-pounds
• Shield Material: 304 Stainless Steel
• Band Material: 304 Stainless Steel
• Screw Material: 305 Stainless Steel
• Eyelet Material: 305 Stainless Steel
• Gasket Supplied: Yes
• Gasket Standard: ASTM C564 Vulcanized Compound
• Material Specification: ASTM C1277
• Applicable Standards: CISPI 310, IAPMO, NSF

Standard Information

• Brand: IDEAL INDUSTRIES
• Manufacturer Part Number: 6231m8g