Value Collection ZMSCHB90425 O-ring 4.5 in Id Nbr 90 Duro

Product Description

The VALUE COLLECTION ZMSCHB90425 is a Dash 8-425 O-ring with a 4.5-inch inside diameter and a rectangular cross section cut from 90-durometer Nitrile Butadiene Rubber (NBR). The extra-hard Shore A rating delivers firm sealing compression in high-load or high-vibration environments. With a rated temperature range of -40 to 250 degrees F, this O-ring handles both low-temperature cold-weather service and the elevated heat found in hydraulic, pneumatic, fuel, and fluid-handling systems. It is sold in a package of 5 pieces. Plumbers, HVAC technicians, and mechanical maintenance trades install NBR O-rings as static face seals, fitting seals, and valve-body seals across a wide range of service equipment.

NBR O-rings in the Dash 8-425 size are commonly used in residential and commercial plumbing connections, HVAC refrigerant-side and hydronic fittings, pool and spa equipment unions, and general industrial fluid-line assemblies. The 4.5-inch inside diameter suits large-bore pipe fittings, pump flanges, and valve bodies where a reliable, chemically resistant seal is required. This size is frequently encountered in pool equipment manifolds, large gate valves, and circulating pump covers in both light commercial and residential applications.

Key Features

• Nitrile Butadiene Rubber (NBR) construction resists petroleum-based oils, fuels, hydraulic fluids, and water
• 90 durometer extra-hard rating provides firm, reliable compression in high-load static seal applications
• Wide service temperature range from -40 to 250 degrees F suits cold-climate and elevated-heat installations
• Rectangular cross-section profile for Dash 8-425 fitment in standard O-ring grooves
• Packaged in a quantity of 5, suitable for service kits, stock replenishment, or multi-unit repairs

Compatibility

Designed as an OEM-style replacement or service seal for large-bore fittings, valves, pump flanges, and fluid-line components requiring a Dash 8-425 O-ring with a 4.5-inch inside diameter and 90-durometer NBR material.

Installation Notes

Plumbers and mechanical technicians should depressurize and drain the system before replacing any O-ring seal. Clean the mating groove and sealing surfaces to remove debris, old seal material, and corrosion before seating the new O-ring. Apply a compatible, system-appropriate lubricant to the O-ring to ease installation and prevent tearing. Verify that the groove dimensions match the Dash 8-425 cross section to ensure proper compression and sealing performance.