Value Collection ZMSCS70258 Silicone O-ring Dash 258 5-pack

Product Description

The VALUE COLLECTION ZMSCS70258 is a Dash 258 silicone O-ring sold in a pack of 5 and designed for static and dynamic sealing applications across HVAC, plumbing, and industrial systems. The ring measures 6 inches inside diameter, 6.25 inches outside diameter, and 0.125 inches thick with a round cross section. Silicone compound provides a working temperature range of -80 degrees F to 450 degrees F, making this O-ring well suited for high-heat and wide-temperature-swing environments. Shore hardness is rated at 70, placing it in the hard range for firm, consistent sealing under pressure.

This O-ring is appropriate for use in HVAC equipment, pool and spa plumbing, chemical handling systems, and general industrial fluid sealing where silicone compatibility is required. The silicone material offers good resistance to weather, ozone, and dry heat. It carries limited oil resistance, so applications involving heavy petroleum-based fluids should be evaluated carefully before use. Each package contains 5 O-rings, and the minimum order quantity is 1 package.

Key Features

• Dash 258 standard sizing: 6 inches ID, 6.25 inches OD, 0.125 inches thick
• Silicone compound rated from -80 degrees F to 450 degrees F continuous service
• Shore 70 hardness for firm sealing in demanding installations
• Round cross section for compatibility with standard O-ring grooves
• Resistant to weathering, ozone, and dry heat exposure
• Compatible with oils, chemicals, and solvents; limited petroleum oil resistance

Compatibility

Designed as an OEM-style replacement or maintenance spare for any system requiring a Dash 258 silicone O-ring with a 6-inch inside diameter and 0.125-inch cross section thickness.

Installation Notes

O-ring installation is typically performed by licensed HVAC technicians, plumbers, or qualified maintenance personnel. Always depressurize and de-energize the system and confirm the seating groove is clean and free of debris before installing. Lubricate the O-ring with a compatible silicone-based lubricant to ease installation and reduce the risk of tearing. Do not stretch or twist the O-ring during seating, as deformation can cause premature seal failure.