Value Collection ZMSCH90429 O-ring Dash 429 Nitrile 90 Duro 10pk

Product Description

The VALUE COLLECTION ZMSCH90429 is a Dash 429 Nitrile Butadiene Rubber (Buna-N) O-ring sized at 4.975 inches inside diameter, 5.5 inches outside diameter, and 0.25 inches thick. Rated at 90 durometer (extra hard), it handles a working temperature range of -40 to 250 degrees F. Buna-N is the most widely used O-ring elastomer in the trade, valued for its excellent resistance to petroleum products, strong compression set retention, and solid tear and abrasion resistance. Each order ships as a package of 10 rings. Installed by plumbers, HVAC technicians, and mechanical tradespeople wherever a reliable fluid seal is needed.

This O-ring is suited for hydraulic, pneumatic, and fluid-handling assemblies where petroleum-based media are present. Its extra-hard 90 durometer rating makes it appropriate for higher-pressure sealing applications where a softer compound would extrude or deform. Typical installation scenarios include pump housings, valve bodies, pipe flanges, and mechanical equipment found in both residential and commercial plumbing and HVAC systems. The package quantity of 10 supports stocking for service calls or light production use.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound — excellent resistance to petroleum products and hydraulic fluids
• 90 durometer extra-hard rating — resists extrusion in higher-pressure sealing applications
• Wide temperature range: -40 to 250 degrees F — suitable for most HVAC and plumbing service environments
• Round cross-section — standard Dash 429 profile for drop-in replacement use
• Meets SAE and MIL-Spec standards
• Package of 10 rings per order quantity

Compatibility

Designed for use with petroleum-based products and compatible fluids; suitable as a standard Dash 429 replacement O-ring in hydraulic, pneumatic, and fluid-handling assemblies requiring a 4.975-inch ID, 5.5-inch OD, 0.25-inch thick round-section seal. Not FDA approved. Should not be stored in direct sunlight or near motors or other electrical equipment that may generate ozone.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or mechanical tradespeople. Depressurize and isolate the system and drain any residual fluid before removing the old O-ring. Inspect the groove and mating surfaces for scoring or contamination before seating the new ring. Avoid using sharp tools that could nick or cut the O-ring surface during installation.