Ever-tite. Coupling Products 307GSKBUMS O-ring Dash 307 Nbr

Product Description

The EVER-TITE. COUPLING PRODUCTS 307GSKBUMS is a Dash 307 square-cross-section O-ring manufactured from Nitrile Butadiene Rubber (NBR), also known as Buna-N. It measures 7/8 inch inside diameter, 1-3/8 inches outside diameter, and 7/32 inch thickness. The square cross-section profile provides increased sealing surface contact compared to a standard round-cross-section O-ring, making it well-suited for static sealing applications in fluid and gas systems. Rated for service from -40 degrees F to 212 degrees F, this O-ring is compatible with petroleum-based products. It is installed by plumbers, HVAC technicians, and mechanical tradespeople working on hydraulic, pneumatic, and fluid-handling assemblies.

This O-ring is used in static face-seal and radial-seal applications across residential and commercial mechanical systems. Typical installations include valve bodies, pipe fittings, pump housings, and manifold connections where a reliable, petroleum-compatible seal is required. The Buna-N material provides solid resistance to oils, fuels, and many hydraulic fluids, making it a common choice in plumbing, HVAC, and light industrial fluid systems. Each unit is sold individually, with a minimum order quantity of 5 pieces.

Key Features

• Square cross-section profile increases sealing surface area for static applications
• Nitrile Butadiene Rubber (Buna-N) construction offers resistance to petroleum products, oils, and hydraulic fluids
• Operating temperature range of -40 degrees F to 212 degrees F suits a wide variety of mechanical service environments
• Dash 307 standard sizing ensures straightforward cross-referencing and replacement
• Black color finish consistent with standard NBR O-ring identification
• Nominal size 3/4 inch for application reference

Compatibility

Compatible with petroleum-based products and fluids. Designed as a standard Dash 307 replacement O-ring for static sealing applications in plumbing, HVAC, and fluid-handling systems requiring a square-cross-section Buna-N seal.

Installation Notes

Installation is typically performed by a licensed plumber or HVAC technician as part of valve, fitting, or pump-housing service. Shut off fluid supply and depressurize the system fully before removing the existing O-ring. Inspect the sealing groove for scoring or corrosion before seating the replacement. Apply a compatible lubricant to the O-ring during installation to prevent tearing and ensure proper seating.