Value Collection ZMSCS70279 Silicone O-ring Dash 279

Product Description

The VALUE COLLECTION ZMSCS70279 is a Dash 279 silicone O-ring with a round cross section, designed for static and dynamic sealing applications across a wide range of operating conditions. The ring measures 13 inches inside diameter and 13.25 inches outside diameter, with a wall thickness of 0.125 inches. Rated at 70 Shore A hardness, this O-ring handles temperatures from -80 degrees F to 450 degrees F, making it well suited for systems that see extreme heat cycling or cold exposure. Plumbers, pipefitters, and maintenance technicians use this size in large-bore assemblies where a reliable silicone seal is required.

This O-ring is appropriate for residential and commercial applications where exposure to oils, chemicals, or solvents occurs at elevated or depressed temperatures. Its silicone compound provides good resistance to dry heat, weathering, and ozone degradation. It is commonly installed in large-diameter pipe flanges, tank access covers, pump housings, and HVAC equipment panels where a compressible face seal or groove-mounted seal is needed. The round cross section seats predictably in standard AS568 Dash 279 grooves.

Key Features

• Wide temperature range: -80 degrees F to 450 degrees F for demanding thermal environments
• 70 Shore A hardness rating provides firm, consistent compression under load
• Round cross section for reliable seating in standard Dash 279 O-ring grooves
• Silicone compound resists ozone, weathering, and dry heat degradation
• Compatible with oils, chemicals, and solvents in appropriate service conditions
• White color aids visual inspection during installation and maintenance

Compatibility

Designed as a standard AS568 Dash 279 replacement O-ring for any application requiring a 13 inch ID silicone seal with a 0.125 inch cross section thickness.

Installation Notes

Installation is performed by plumbers, pipefitters, or qualified maintenance technicians. Before replacing the O-ring, relieve all system pressure and drain or isolate the affected section per applicable IPC or facility lockout-tagout procedures. Inspect the groove for nicks, corrosion, or debris before seating the new O-ring. Do not roll or twist the ring during installation, as distortion can cause premature seal failure.