Value Collection ZMSCS70342 Silicone O-ring Dash 342 5-pack

Product Description

The VALUE COLLECTION ZMSCS70342 is a Dash 342 silicone O-ring sold in a pack of 5, designed for static and dynamic sealing applications across HVAC, plumbing, and industrial systems. It measures 3.625 inches inside diameter, 4.0 inches outside diameter, and 0.1875 inches thick with a round cross section. The silicone compound delivers a wide service temperature range of -80 degrees F to 450 degrees F, making it suitable for dry heat environments, outdoor exposure, and applications where ozone and weather resistance are required. Hardness is rated at 70 Shore A. Licensed tradespeople and maintenance technicians use this O-ring for sealing flanges, ports, and fittings in equipment that cycles through extreme temperature ranges.

This O-ring is appropriate for residential and commercial HVAC equipment, plumbing assemblies, and general industrial machinery where silicone elastomers are specified. It performs well in dry heat, outdoor weathering, and ozone-exposed environments. The silicone material offers limited oil resistance, so it is best suited for applications involving air, water, mild chemicals, and solvents rather than petroleum-based fluids. Each order includes 5 O-rings, making it practical for service calls that require spares or replacement of multiple seals in a single system.

Key Features

• Silicone compound handles service temperatures from -80 degrees F to 450 degrees F
• Round cross section with 0.1875-inch thickness for consistent seating in standard grooves
• 70 Shore A hardness rated Hard for firm, reliable sealing under compression
• Good resistance to weather, ozone, and dry heat
• Compatible with oils, chemicals, and solvents where silicone is the specified material
• Pack of 5 units per order supports multi-seal jobs and service stock

Compatibility

Designed as an OEM-style replacement silicone O-ring for equipment requiring a Dash 342 seal with a 3.625-inch inside diameter and 4.0-inch outside diameter. Consult equipment service documentation to confirm groove dimensions and elastomer compatibility before installation.

Installation Notes

Installation is performed by licensed HVAC technicians, plumbers, or qualified maintenance personnel. Always depressurize and de-energize the system before removing an existing O-ring or installing a replacement. Clean the groove and mating surfaces of debris and old seal material before seating the new O-ring. Do not use petroleum-based lubricants with silicone O-rings; use a silicone-compatible lubricant only if lubrication is required by the equipment manufacturer.