Value Collection ZMSCS70238 Silicone O-ring Dash 238 5-pack

Product Description

The VALUE COLLECTION ZMSCS70238 is a Dash 238 silicone O-ring sold in a pack of five, designed for static and dynamic sealing applications across a broad temperature range. With a 3.5-inch inside diameter, 3.75-inch outside diameter, and 0.125-inch wall thickness, this O-ring fits standard Dash 238 grooves without modification. The round cross section provides consistent compression and sealing contact. Silicone compound delivers reliable performance from -80 degrees F to 450 degrees F, making it a practical choice where wide thermal cycling, dry heat resistance, or ozone and weather exposure are primary concerns. Hardness is rated at 70 Shore A, classified as hard.

This O-ring is suited for HVAC equipment seals, plumbing fittings, pump housings, and general mechanical assemblies where silicone is the specified compound. It is compatible with oils, chemicals, and solvents within its rated limits, though oil resistance is limited relative to other silicone grades. Technicians and maintenance professionals working on heating, cooling, and fluid-handling systems commonly specify Dash 238 O-rings for cover plate gaskets, end caps, and port seals. Each order ships as a pack of five pieces.

Key Features

• Silicone compound rated from -80 degrees F to 450 degrees F for wide thermal range service
• Round cross section with 3.5-inch ID and 3.75-inch OD to standard Dash 238 dimensions
• 70 Shore A hardness (hard rating) for firm compression seal
• Resistant to weather and ozone degradation
• Compatible with oils, chemicals, and solvents within rated limits; limited oil resistance noted
• Sold in a pack of five for service inventory and replacement stock

Compatibility

Designed as a standard Dash 238 O-ring replacement for any groove or port machined to Dash 238 specifications requiring a silicone compound seal.

Installation Notes

Power down or depressurize the system before removing or installing any O-ring seal. Clean the seating groove of debris, old sealant, and residual compound before installing the replacement. Inspect the groove dimensions to confirm they match Dash 238 specifications prior to installation. O-ring installation is a common task for licensed HVAC technicians, plumbers, and mechanical service professionals working under applicable codes.