Value Collection ZMSCH70MD018 O-ring Dash 018 Nbr 25-pack

Product Description

The VALUE COLLECTION ZMSCH70MD018 is a Dash 018 Nitrile Butadiene Rubber (Buna-N) O-ring designed for sealing applications across HVAC, plumbing, hydraulic, and mechanical systems. With a 0.739-inch inside diameter, 0.875-inch outside diameter, and a 0.0625-inch thick round cross section, this O-ring meets standard Dash 018 dimensional specifications. Rated for service from -40 degrees F to 250 degrees F, it is compatible with petroleum-based fluids and offers reliable compression set resistance, tear resistance, and abrasion resistance. Each package contains 25 O-rings. Installation is performed by licensed plumbers, HVAC technicians, or mechanical service professionals.

Buna-N O-rings in the Dash 018 size are commonly used in residential and commercial applications wherever a 3/4-inch ID seal is required. Typical uses include refrigerant service fittings, hydraulic line connections, pump seals, valve bodies, and fluid-handling assemblies. This O-ring is suited for use with petroleum products and mineral-based oils but should not be used in applications involving ozone-rich environments, direct sunlight exposure, or proximity to motors and other electrical equipment that may generate ozone.

Key Features

• Dash 018 standard sizing: 0.739 inches ID, 0.875 inches OD, 0.0625 inches thick
• Buna-N (Nitrile Butadiene Rubber) material — the most widely used O-ring elastomer
• Rated -40 degrees F to 250 degrees F operating temperature range
• Excellent resistance to petroleum products, mineral oils, and hydraulic fluids
• Round cross section with hard (70 durometer) hardness rating for reliable compression set
• Black color; sold in a package of 25

Compatibility

Compatible with petroleum products and mineral-based fluid systems. Designed as a standard Dash 018 O-ring replacement for any application requiring a 0.739-inch ID Buna-N seal.

Installation Notes

Installation is typically performed by a licensed plumber, HVAC technician, or hydraulic systems mechanic. Shut off and depressurize the system completely before removing or installing any O-ring seal. Inspect the mating groove and sealing surface for damage or contamination before installing the new O-ring. Do not store unused O-rings in direct sunlight or near motors and other electrical equipment that may generate ozone, as this will degrade the Buna-N material.