Value Collection ZMSCS70904 Silicone O-ring Dash 904

Product Description

The VALUE COLLECTION ZMSCS70904 is a Dash 904 silicone O-ring used as a boss gasket for straight-thread tube fittings. It measures 0.351 inches inside diameter, 0.495 inches outside diameter, and 0.072 inches thick with a round cross section. The compound is rated for a wide service temperature range of -80 degrees F to 450 degrees F, making it well suited for applications that demand reliable sealing under extreme heat or cold. Hardness is rated at 70 Shore A. Each package contains 50 pieces. Licensed plumbers, HVAC technicians, and pipefitters are the typical installers for this type of fitting seal.

This O-ring is designed for use in systems where good dry heat resistance, weather resistance, and ozone resistance are required. It performs in a broad range of fluid and gas handling assemblies that use straight-thread boss-style fittings. The silicone compound offers limited oil resistance, so it is best suited for dry gas, water, or light-fluid service rather than hydrocarbon-heavy environments. It is sold in a 50-piece pack, making it a practical bench stock item for service vans or shop use.

Key Features

• Silicone compound rated from -80 degrees F to 450 degrees F for wide temperature range service
• Round cross section boss gasket for straight-thread tube fittings (Dash 904)
• 70 Shore A hardness for a firm, reliable seal under compression
• Good weather and ozone resistance for outdoor or exposed installations
• White color for easy visual identification during installation or inspection
• Sold in a 50-piece package to support bulk service and stocking needs

Compatibility

Designed as a standard Dash 904 boss gasket for straight-thread tube fittings in plumbing, HVAC, and fluid handling assemblies requiring a silicone compound seal.

Installation Notes

Installation is typically performed by licensed plumbers or HVAC technicians as part of threaded fitting assembly work. Depressurize and drain the system before replacing any O-ring in a live fluid or gas line. Seat the O-ring squarely in the boss groove before threading the fitting to avoid rolling or pinching the ring during torque. Because this compound offers limited oil resistance, confirm that the service fluid is compatible with silicone before installation.