Value Collection ZMSCS70252 Silicone O-ring Dash 252 5pk

Product Description

The VALUE COLLECTION ZMSCS70252 is a silicone O-ring with a round cross section, designed for static and dynamic sealing applications across a wide temperature range. It measures 5.25 inches inside diameter, 5.5 inches outside diameter, and 0.125 inches thick, conforming to Dash 252 dimensional standards. Rated at 70 Shore A hardness, this O-ring handles continuous service from -80 degrees F to 450 degrees F, making it well suited for high-heat environments where dry heat resistance and ozone resistance are required. Licensed tradespeople and maintenance technicians install this part in mechanical systems where reliable sealing under thermal cycling is critical.

This O-ring is appropriate for use in residential and commercial mechanical systems where silicone sealing material is specified. Typical applications include HVAC equipment, plumbing assemblies, and industrial fluid handling where exposure to oils, chemicals, or solvents at elevated temperatures occurs. The white silicone compound provides good weather and ozone resistance. Note that oil resistance is limited, so verify compatibility with the fluid media before installation. Each package contains 5 O-rings.

Key Features

• Silicone material rated for -80 degrees F to 450 degrees F service temperature range
• Dash 252 standard dimensions: 5.25 inches ID, 5.5 inches OD, 0.125 inches thick
• 70 Shore A hardness rating for firm, reliable sealing compression
• Round cross section for consistent sealing contact in standard O-ring grooves
• Good weather and ozone resistance for outdoor or exposed installations
• Compatible with oils, chemicals, and solvents within silicone material limits

Compatibility

Designed as a Dash 252 standard O-ring replacement for any groove or fitting that calls for a 5.25-inch ID silicone O-ring with 0.125-inch cross section thickness.

Installation Notes

O-ring installation is typically performed by licensed plumbers, HVAC technicians, or mechanical tradespeople. De-pressurize and drain the system or component before removing the old O-ring. Inspect the groove for nicks, burrs, or corrosion that could compromise the seal. Avoid over-stretching the O-ring during installation, and do not use petroleum-based lubricants with silicone compounds unless confirmed compatible with the system fluid.