Value Collection ZMSCS70253 Silicone O-ring Dash 253 5-pack

Product Description

The VALUE COLLECTION ZMSCS70253 is a silicone O-ring with a round cross section, designed for static and dynamic sealing applications across a wide range of operating temperatures. It measures 5.375 inches inside diameter, 5.625 inches outside diameter, and 0.125 inches thick, conforming to Dash 253 sizing. With a Shore A hardness rating of 70 and a working temperature range of -80 degrees F to 450 degrees F, this O-ring is suited for environments that demand dry heat resistance and reliable weather and ozone resistance. It is installed by plumbers, HVAC technicians, maintenance mechanics, and industrial service technicians.

This O-ring is commonly used in fluid handling systems, HVAC equipment, chemical processing lines, and general industrial machinery where a large-diameter seal is required. The silicone compound offers good resistance to oils, chemicals, and solvents, though oil resistance is limited compared to nitrile-based alternatives. It is a practical choice for sealing flanges, housings, and access covers in both residential and commercial service environments. Sold in a package of 5.

Key Features

• Silicone compound with a wide temperature range from -80 degrees F to 450 degrees F
• Round cross section in Dash 253 sizing for standardized fitment
• Shore A hardness of 70 for firm, reliable sealing compression
• Good resistance to weather and ozone degradation
• Compatible with oils, chemicals, and solvents; note limited oil resistance relative to nitrile
• Sold as a pack of 5 units

Compatibility

Designed as a standard Dash 253 O-ring replacement for any application requiring a 5.375-inch ID silicone seal, including HVAC equipment housings, plumbing flanges, and industrial fluid system components.

Installation Notes

Shut off fluid flow and relieve system pressure before removing the existing O-ring. Clean the groove and mating surfaces thoroughly before seating the new ring to prevent rolling or uneven compression. Avoid using petroleum-based lubricants on silicone O-rings; use a silicone-compatible lubricant if lubrication is required. Follow applicable codes such as the IPC or IFGC for plumbing and gas system sealing applications.