Value Collection ZMSCH70143 O-ring Dash 143 Buna-n

Product Description

The VALUE COLLECTION ZMSCH70143 is a Dash 143 nitrile butadiene rubber (Buna-N) O-ring designed for static and dynamic sealing applications across plumbing, HVAC, hydraulic, and fluid-handling systems. It measures 2.438 inches inside diameter, 2.625 inches outside diameter, and 0.094 inches thick with a round cross section. The 70-durometer hardness rating delivers firm compression set resistance alongside solid tear and abrasion resistance. Rated for service from -40 degrees F to 250 degrees F, this O-ring performs reliably across a wide temperature range in petroleum-based fluid environments. Licensed trades and maintenance technicians install this type of seal during equipment overhaul, valve service, and pump repair work.

This O-ring is suited for residential and commercial applications wherever a Dash 143 standard seal is specified. Typical use cases include pump housings, valve bodies, fittings, and fluid-system components that contact petroleum-based media. Buna-N is the most widely used O-ring elastomer in the trades because of its broad compatibility with petroleum products, hydraulic oils, and fuels. This part ships in a package quantity of 50, making it practical for shop stock and service van inventory. It meets SAE and MIL-Spec standards.

Key Features

• Buna-N (nitrile butadiene rubber) construction with excellent resistance to petroleum products
• 70 durometer hardness rating — firm, hard classification for reliable compression sealing
• Operating temperature range: -40 degrees F to 250 degrees F
• Round cross section per Dash 143 standard sizing
• Meets SAE and MIL-Spec standards
• Package quantity of 50 for shop stock and high-volume service use

Compatibility

Designed as a standard Dash 143 O-ring replacement compatible with petroleum-based fluid systems including hydraulic circuits, valve assemblies, and pump components where Buna-N elastomer is specified. Not recommended for applications involving ozone, direct sunlight exposure, or electrical equipment that generates ozone.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or hydraulic equipment technicians. De-pressurize and drain the system completely before removing the old O-ring. Inspect the gland seat for scoring or debris that could compromise the new seal. Lightly lubricate the O-ring with a compatible petroleum-based or system-fluid lubricant before seating to prevent twisting or rolling during assembly.