Value Collection ZMSCS70039 Silicone O-ring Dash 039

Product Description

The VALUE COLLECTION ZMSCS70039 is a silicone O-ring with a round cross section, sized to Dash 039 standards. It measures 2.75 inches inside diameter, 2.875 inches outside diameter, and 0.0625 inches thick. Rated at 70 Shore hardness, this O-ring handles a wide service temperature range from -80 degrees F to 450 degrees F, making it well-suited for applications requiring dry heat resistance and stable sealing performance across temperature extremes. Plumbers, HVAC technicians, and maintenance professionals install this type of O-ring as a static or low-motion face seal or radial seal in fluid and gas systems. Each package contains 10 O-rings.

This silicone O-ring is appropriate for use in residential and commercial systems where good weather resistance, ozone resistance, and moderate chemical compatibility are required. Silicone material provides good resistance to oils, certain chemicals, and solvents, though oil resistance is limited compared to nitrile or fluorocarbon alternatives. Typical applications include HVAC equipment fittings, plumbing connections, and general industrial assemblies that see elevated or sub-zero temperatures. This O-ring is not FDA approved and should not be used in food-contact applications.

Key Features

• Temperature range of -80 degrees F to 450 degrees F for wide thermal envelope coverage
• 70 Shore hardness (Hard rating) for firm, reliable compression sealing
• Round cross section for standard groove compatibility
• Silicone material provides good weather and ozone resistance
• Compatible with oils, certain chemicals, and solvents; limited oil resistance noted
• Sold in a pack of 10 for service and maintenance stocking

Compatibility

Designed as a standard Dash 039 O-ring replacement for any system or fitting that accepts a 2.75 inches ID round-cross-section O-ring in silicone material.

Installation Notes

Installation should be performed by a qualified plumber, HVAC technician, or maintenance professional after depressurizing and draining the system. Inspect the seating groove for damage, debris, or wear before installing the new O-ring. Avoid twisting or stretching the O-ring during installation, as distortion can lead to premature seal failure. Confirm material compatibility with the system fluid or gas before installation, particularly in applications with prolonged hydrocarbon oil exposure.