Value Collection ZMSCS70357 Silicone O-ring Dash 357

Product Description

The VALUE COLLECTION ZMSCS70357 is a silicone O-ring with a round cross section, rated at 70 durometer hardness and engineered for a wide operating temperature range of -80 degrees F to 450 degrees F. It features a 5.5-inch inside diameter, a 5.875-inch outside diameter, and a 0.1875-inch (3/16 inches) cross-section thickness. Silicone compound gives this seal strong resistance to dry heat, weathering, and ozone exposure. It is suited for static sealing applications across HVAC, plumbing, pool equipment, and general industrial systems. Licensed tradespeople and maintenance technicians install this ring where a reliable, heat-tolerant seal is required.

This O-ring is rated for use with oils, chemicals, and solvents, though oil resistance is limited compared to nitrile or fluorocarbon compounds. It is appropriate for residential and commercial applications where wide temperature swings and outdoor ozone exposure are concerns, such as chiller fittings, pump housings, valve assemblies, and pool equipment sealing points. Each order ships in a package of 5 rings. This is a hard-rated silicone seal and is not FDA approved.

Key Features

• Silicone compound rated -80 degrees F to 450 degrees F operating range
• 70 durometer hardness with round cross-section profile
• Good resistance to weathering, ozone, and dry heat
• Compatible with oils, chemicals, and solvents (limited oil resistance)
• Dash 357 industry-standard sizing for straightforward replacement sourcing
• Sold in a package of 5 rings per order unit

Compatibility

Designed as a standard Dash 357 O-ring replacement for static sealing applications in HVAC, plumbing, pool, and general industrial equipment requiring a 5.5-inch ID silicone seal.

Installation Notes

O-rings of this size are typically installed by licensed HVAC technicians, plumbers, or pool service professionals. Shut down and depressurize the system fully before removing any fittings or housings. Seat the ring evenly in the groove without twisting or stretching; a light coating of compatible lubricant helps prevent roll-out during assembly. Verify the groove dimensions match the Dash 357 specification before installation.