Value Collection ZMSCH70427 O-ring Dash 427 Nitrile 70 Duro 5-pack

Product Description

The VALUE COLLECTION ZMSCH70427 is a Dash 427 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in sealing applications. It measures 4.75 inches inside diameter by 5.25 inches outside diameter with a 0.25 inch cross-sectional thickness and a round cross-section profile. Rated at 70 Shore A hardness, this O-ring delivers excellent compression set resistance along with strong tear and abrasion resistance. It is sold in a pack of 5 and is well suited for plumbing, hydraulic, pneumatic, and HVAC service work where petroleum-fluid compatibility is required.

This O-ring is designed for use in systems that handle petroleum-based fluids, oils, and fuels. Its Buna-N compound performs reliably across a temperature range of -40 degrees F to 250 degrees F, making it appropriate for both ambient and moderately elevated temperature service environments. It is a common replacement seal in pump housings, valve bodies, manifold ports, and pipe fittings encountered in residential and commercial HVAC, plumbing, and mechanical service work. Licensed tradespeople and experienced technicians handling fluid system maintenance will find this a standard utility seal for larger-bore applications.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound — excellent resistance to petroleum products, oils, and fuels
• 70 Shore A hardness rating for reliable compression set and sealing force in standard fluid system applications
• Operating temperature range: -40 degrees F to 250 degrees F
• Round cross-section profile; 0.25 inch cross-sectional thickness for accurate groove fitment
• Meets SAE and MIL-Spec standards
• Pack of 5 units per package; minimum order quantity of 1 package
• Store away from direct sunlight and ozone-generating equipment such as electric motors to preserve elastomer integrity

Compatibility

Designed as an OEM-style replacement Dash 427 O-ring for applications requiring a 4.75 inch ID by 5.25 inch OD by 0.25 inch thick Buna-N seal in petroleum-fluid-compatible service. Compatible with petroleum products per manufacturer material specifications.

Installation Notes

Installation should be performed by a qualified tradesperson following applicable codes such as IFGC, IPC, or NEC as relevant to the system being serviced. Always depressurize and de-energize the system and drain residual fluid before removing the old O-ring or installing the replacement. Lubricate the O-ring with a compatible fluid or O-ring lubricant prior to seating to prevent tearing during installation. Do not store Buna-N O-rings near electric motors, ozone-generating equipment, or in direct sunlight, as ozone and UV exposure degrade nitrile elastomers.