Value Collection ZMSCH70166 O-ring Dash 166 Nitrile 25 Pack

Product Description

The VALUE COLLECTION ZMSCH70166 is a Dash 166 Buna-N (Nitrile Butadiene Rubber) o-ring with a round cross section, designed for use in fluid sealing applications across plumbing, HVAC, and industrial systems. It measures 6.75 inches inside diameter, 6.938 inches outside diameter, and 0.0937 inches thick. The 70-durometer hardness rating provides a firm, reliable seal under compression. This o-ring is sold in a package of 25 and is installed by licensed plumbers, HVAC technicians, and maintenance professionals working on systems that handle petroleum-based fluids.

This o-ring is suited for residential and commercial applications where a large-diameter, petroleum-resistant seal is required. Typical uses include pump housings, valve bonnets, filter canisters, and fluid line connections that contact petroleum products. The Buna-N compound is the most widely used o-ring elastomer in the trade and performs reliably across a broad temperature range of -40 degrees F to 250 degrees F. Store away from direct sunlight, ozone sources, and electrical equipment that may generate ozone.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound offers excellent resistance to petroleum products
• 70 Shore A hardness rating provides firm compression set performance
• Round cross section, 0.0937 inches thick, conforms to Dash 166 sizing
• Operating temperature range: -40 degrees F to 250 degrees F
• Meets SAE and MIL-Spec standards
• Sold as a package of 25 units, minimum order quantity of 1 package

Compatibility

Designed as an OEM-style replacement or service o-ring for any application requiring a Dash 166 size seal in systems compatible with Buna-N elastomers and petroleum-based fluids.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or qualified maintenance personnel. Depressurize and drain the system completely before removing the old o-ring and installing the replacement. Lightly lubricate the o-ring with a compatible fluid or grease before seating to prevent tearing during assembly. Do not expose installed o-rings to ozone-generating equipment or direct sunlight during storage or service.