Value Collection ZMSCS70203 Silicone O-ring Dash 203 50-pack

Product Description

The VALUE COLLECTION ZMSCS70203 is a Dash 203 silicone O-ring designed for static and dynamic sealing applications across HVAC, plumbing, and industrial service work. The ring measures 0.313 inches inside diameter, 0.563 inches outside diameter, and 0.125 inches thick with a round cross section. Shore hardness is rated at 70, placing it in the hard range. Silicone construction gives this O-ring a wide service temperature range of -80 degrees F to 450 degrees F, making it suitable for high-heat and cold-environment installs where standard nitrile or EPDM compounds fall short. Sold in a pack of 50.

This O-ring is appropriate for applications requiring resistance to dry heat, weathering, and ozone exposure. It carries limited oil resistance, making it best suited for systems where exposure to petroleum-based oils is minimal or incidental. Typical uses include HVAC equipment fittings, duct and air-handler connections, chemical-handling assemblies, and general plumbing seals where silicone is specified. Trade professionals in HVAC service, plumbing, and industrial maintenance commonly stock Dash 203 silicone rings for recurring seal replacement work.

Key Features

• Silicone material rated from -80 degrees F to 450 degrees F for wide-temperature-range service
• Dash 203 standard sizing: 0.313 inches ID, 0.563 inches OD, 0.125 inches thick
• Shore 70 hardness for firm, reliable sealing compression
• Round cross section for consistent groove fit and even load distribution
• Good resistance to weathering, ozone, and dry heat
• Pack of 50 units supports bulk service and stocking needs

Compatibility

Designed as a standard Dash 203 replacement O-ring compatible with equipment and fittings that specify a Dash 203 silicone seal with 0.313 inches ID and 0.125 inches cross-section thickness. Compatible with oils, chemicals, and solvents as noted; verify silicone compatibility with the specific fluid or gas present in the application before installation.

Installation Notes

O-ring replacement is typically performed by HVAC technicians, plumbers, or industrial maintenance technicians. Before servicing any fitting or valve, relieve system pressure, shut off fluid supply, and allow components to reach ambient temperature. Lubricate the O-ring with a compatible silicone-based lubricant before seating to prevent tearing during assembly; do not use petroleum-based grease with silicone O-rings unless verified compatible. Inspect the groove and mating surface for nicks or corrosion before installing the new ring.