Value Collection ZMSCH70271 O-ring Dash 271 Buna-n 70A

Product Description

The VALUE COLLECTION ZMSCH70271 is a Dash 271 O-ring with a 9.25-inch inside diameter, 9.5-inch outside diameter, and 0.125-inch cross-section thickness. Made from Nitrile Butadiene Rubber (Buna-N), it carries a 70 Shore A hardness rating and a round cross-section profile. Buna-N is the most widely used O-ring elastomer in trade applications, valued for its excellent resistance to petroleum-based fluids, strong compression set characteristics, and reliable tear and abrasion resistance. Licensed HVAC techs, plumbers, and equipment service technicians install this type of seal in fluid-handling assemblies, pump housings, valve bodies, and flanged connections.

This O-ring is suited for use in systems that handle petroleum products, hydraulic fluids, and similar media. The rated temperature range of -40 degrees F to 250 degrees F makes it appropriate for a wide range of residential and light commercial mechanical systems. It is commonly used as a static or dynamic face seal in plumbing, HVAC refrigerant-free fluid circuits, pump assemblies, and industrial fluid-transfer components where a large-diameter seal is required. The package contains 5 O-rings per unit. Note that this part is not FDA approved and should not be stored in direct sunlight or near motors or electrical equipment that may generate ozone.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction with excellent petroleum-product resistance
• 70 Shore A hardness rating for a firm, reliable seal under compression
• Round cross-section profile for consistent seating in standard O-ring grooves
• Operating temperature range: -40 degrees F to 250 degrees F
• Meets SAE and MIL-Spec standards
• Package quantity of 5 units per order

Compatibility

Designed as a Dash 271 standard O-ring replacement compatible with petroleum-based fluid systems. Suitable for use with hydraulic oils, fuels, and other petroleum products. Not compatible with ozone-generating environments, direct UV exposure, or applications requiring FDA-approved materials.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or mechanical service technicians. Always depressurize and drain the system before replacing O-ring seals, and verify the groove dimensions match the Dash 271 specification before installation. Lightly lubricating the O-ring with a compatible fluid prior to seating helps prevent rolling or twisting during assembly. Avoid overstretching the O-ring during installation to maintain sealing integrity.