Value Collection BDNA--9978-2 O-ring Dash 109 Nbr

Product Description

The VALUE COLLECTION BDNA--9978-2 is a Dash 109 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N) with a round cross section. It measures 5/16 inches inside diameter and 3/32 inches in thickness, with a durometer rating of 70 Shore A. Buna-N material provides reliable resistance to petroleum-based fluids, hydraulic oils, and moderate temperature ranges, making this O-ring a standard choice for sealing applications across HVAC, plumbing, and general mechanical systems. Installation is performed by licensed technicians and maintenance professionals working on fluid-handling or pneumatic assemblies.

This O-ring is suited for use in residential and light commercial applications where a Dash 109 inch-series O-ring is required. Typical use cases include valve stems, fittings, pump housings, and fluid line connections where a reliable static or dynamic face seal is needed. The Buna-N compound performs well in contact with water, oils, and many common refrigerants, making it a versatile replacement seal for trade service work.

Key Features

• Dash 109 inch-series O-ring for standardized fitment across compatible grooves
• Nitrile Butadiene Rubber (Buna-N) construction with resistance to petroleum-based fluids and oils
• Round cross section for consistent seating and seal integrity
• 70 Shore A durometer provides a balance of flexibility and compression resistance
• Inch measurement system for direct replacement in standard US-spec assemblies

Compatibility

Designed as a standard Dash 109 inch-series replacement O-ring for use in equipment and assemblies requiring a 5/16 inch inside diameter, 3/32 inch thick Buna-N seal.

Installation Notes

This O-ring is installed by HVAC technicians, plumbers, or mechanical service professionals during valve, pump, or fitting service. Always depressurize and de-energize the system before removing any seals or fittings. Inspect the mating groove for wear or damage before installing a new O-ring, and apply a compatible lubricant to ease installation and prevent pinching or rolling. Follow applicable codes and manufacturer guidelines for the host equipment.