Value Collection ZMSCH90442 O-ring Dash 442 Nbr 90 Duro

Product Description

The VALUE COLLECTION ZMSCH90442 is a Dash 442 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N) with an extra-hard 90 durometer rating. It measures 7.25 inches inside diameter, 7.75 inches outside diameter, and 0.25 inches thick with a round cross section. The part is rated for a working temperature range of -40 to 250 degrees F, making it suitable for demanding sealing applications across HVAC, plumbing, and fluid-handling systems. Buna-N is the most widely used O-ring elastomer in trade applications, valued for its resistance to petroleum products, good compression set characteristics, and strong tear and abrasion resistance. Plumbers, HVAC technicians, and industrial maintenance professionals install this part in both new assemblies and service replacements.

This O-ring is suited for use in residential and commercial systems where petroleum-based fluids, refrigerant oils, or hydraulic media are present. The Dash 442 designation is a standard sizing reference used across a wide range of equipment platforms, allowing this part to serve as a direct dimensional replacement in pumps, valves, flanges, compressors, and pipe fittings wherever a 7.25-inch ID O-ring groove is specified. It meets SAE and MIL-Spec standards, confirming dimensional and material compliance for professional use. Packaged in quantities of 10 per unit.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction offers excellent resistance to petroleum products and lubricating oils
• Extra-hard 90 durometer rating for high-pressure and high-compression applications
• Operating temperature range of -40 to 250 degrees F covers broad service conditions
• Round cross section with 0.25-inch thickness meets standard Dash 442 groove dimensions
• Compliant with SAE and MIL-Spec standards for dimensional and material requirements
• Black color; packaged 10 per unit with a minimum order quantity of 1

Compatibility

Designed as a standard Dash 442 dimensional replacement O-ring for pumps, valves, compressors, flanges, and pipe fittings that specify a 7.25-inch inside diameter, 7.75-inch outside diameter, 0.25-inch thick round-cross-section groove. Compatible with petroleum-based fluids and lubricants. Not FDA approved; not recommended for direct food-contact applications.

Installation Notes

Shut down and depressurize the system completely before removing the existing O-ring or installing a replacement. Clean the groove of debris, old lubricant, and any remnants of the prior seal before seating the new ring. Apply a compatible O-ring lubricant to ease installation and prevent tearing during assembly. Store unused Buna-N O-rings away from direct sunlight, ozone sources, and electrical equipment such as motors to avoid premature degradation.