Value Collection ZMSCVB75238 Viton O-ring Dash 238 5 Pack

Product Description

The VALUE COLLECTION ZMSCVB75238 is a Dash 238 Viton (fluoroelastomer) O-ring sold in a 5-piece pack. It measures 3.5 inches inside diameter, 3.75 inches outside diameter, and 0.125 inches thick with a round cross section. The compound carries a Shore A hardness rating of 75 and is rated for continuous service from -15 degrees F to 400 degrees F. Fluoroelastomer construction delivers low compression set, high temperature resistance, and low gas permeability, making it a reliable sealing choice for demanding fluid and vacuum service applications. Licensed HVAC techs, plumbers, and industrial mechanics reach for this material when standard nitrile would fail under heat or chemical exposure.

This O-ring is suited for residential and commercial sealing applications involving petroleum-based fluids, hydraulic oils, fuels, and high-temperature process media. The Dash 238 designation matches standard AN and aerospace O-ring sizing charts, making cross-referencing straightforward for maintenance and repair work. Its broad chemical compatibility and vacuum service suitability make it appropriate for refrigeration service ports, fuel system fittings, hydraulic couplings, and similar connections where a reliable fluoroelastomer seal is required.

Key Features

• Fluoroelastomer (Viton) compound rated from -15 degrees F to 400 degrees F
• Dash 238 standard sizing: 3.5 inches ID, 3.75 inches OD, 0.125 inches thick
• Shore A hardness 75 for firm, low-compression-set sealing
• Good resistance to petroleum products, hydraulic fluids, and fuels
• Low gas permeability — suitable for vacuum service applications
• Sold as a 5-piece pack for bench stock and field inventory

Compatibility

Compatible with petroleum products and most hydrocarbon-based fluids. Designed as a standard Dash 238 fluoroelastomer O-ring for use wherever an AN-standard 3.5-inch ID round-cross-section seal is specified.

Installation Notes

Installation is performed by plumbers, HVAC technicians, hydraulic system mechanics, or other qualified tradespeople. Always depressurize and drain the system before removing or installing O-rings. Lightly lubricate the O-ring with a compatible fluid or grease before seating to prevent tearing during assembly. Do not roll or twist the ring into the groove — seat it evenly to prevent extrusion under pressure.