Value Collection ZMSCH70279 O-ring Dash 279 Buna-n 13 in Id

Product Description

The VALUE COLLECTION ZMSCH70279 is a Dash 279 Buna-N (Nitrile Butadiene Rubber) O-ring with a round cross section, manufactured to SAE and MIL-Spec standards. It measures 13 inches inside diameter, 13.25 inches outside diameter, and 0.125 inches thick, with a 70 Shore hardness rating classified as hard. This O-ring provides excellent resistance to petroleum-based fluids and delivers strong compression set, tear resistance, and abrasion resistance. It is installed by licensed plumbers, HVAC technicians, and mechanical service professionals in fluid sealing applications across a wide range of industrial and trade systems.

This O-ring is suited for static and dynamic sealing applications where exposure to petroleum products, hydraulic fluids, or oils is expected. Its Buna-N compound is the most widely used O-ring elastomer in trade applications, making it a standard choice for pump seals, valve packing, pipe fittings, and fluid system connections in both residential and commercial settings. The large 13-inch inside diameter makes it appropriate for sizable flanged connections, tank lids, or large-bore valve assemblies. Packages contain 5 pieces per unit.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound with excellent resistance to petroleum products and hydraulic fluids
• 70 Shore hardness rating for reliable compression set and seal retention
• Operating temperature range of -40 degrees F to 250 degrees F
• Round cross section conforms to SAE and MIL-Spec standards
• Strong tear and abrasion resistance for demanding service environments
• Sold in packages of 5 pieces

Compatibility

Compatible with petroleum-based fluids and products. Designed as a standard Dash 279 O-ring replacement for large-bore sealing applications in plumbing, HVAC, hydraulic, and mechanical fluid systems.

Installation Notes

Installation is typically performed by licensed plumbers or mechanical service technicians. De-energize and depressurize the system completely before removing the old O-ring or installing the replacement. Inspect the sealing groove for nicks, burrs, or corrosion before seating the new ring. Avoid storing Buna-N O-rings in direct sunlight or near motors and electrical equipment that may generate ozone, as ozone exposure degrades the elastomer.