3 inch Hub-Fit Mechanical Gripper Plug

3 inch Mechanical Gripper Plug – Hub-Fit Design for DWV and Testing Applications

The 3 Inch Hub-Fit Mechanical Gripper Plug is engineered for sealing and testing hub fittings in non-pressurized piping systems. This mechanical plug is suitable for use in DWV (Drain, Waste, and Vent) applications and is designed to create a secure seal within standard cast iron or plastic hub fittings.

Key Functional Advantages

Fabricated for both temporary and permanent applications, this mechanical plug features an expanding rubber gasket and adjustable steel mechanism, ensuring uniform sealing across the internal circumference of the hub. Ideal for testing or isolating lines during system installation or maintenance.

• ✅ Positive Mechanical Seal Expansion-based design uses a turn screw or wing nut to compress the gasket within the hub.
• ✅ Hub-Fit Compatibility Sized to seat securely in 3-inch DWV hub ends without adhesives or bonding agents.
• ✅ Reusable Construction Designed for multiple uses in jobsite testing or line isolation procedures.
• ✅ Non-Corrosive Components Includes high-durability rubber and corrosion-resistant hardware for extended field use.
• ✅ Tool-Free Installation Tightening mechanism allows secure placement using hand tools or no tools, depending on plug model.

Technical Specifications

• Nominal Size: 3 Inch
• Application Fit: DWV Hub-End
• Connection Type: Mechanical Expansion (Gripper Mechanism)
• Material Composition: Elastomeric gasket, stainless or zinc-plated steel components
• Certifications: Conforms to ASTM standards for DWV system testing requirements

Primary Applications

Commonly used by plumbing and mechanical contractors for pressure and leak testing of DWV lines, the 3 inch gripper plug is also used for temporary line isolation, system maintenance, and backflow prevention during phased installation.

Industry Note

Mechanical hub plugs provide a field-serviceable alternative to glued or solvent-welded caps. Their removability and repeat use make them a preferred choice in staged installation environments or during rough-in inspections.

The 3 inch Hub-Fit Mechanical Gripper Plug offers secure, repeatable sealing for DWV system installations requiring testability and maintenance access. Ideal for residential, commercial, and institutional job sites where code-compliant pressure testing and clean sealing are critical to project success.