Value Collection ZMSCH70242 O-ring Dash 242 Buna-n Pack of 50

Product Description

The VALUE COLLECTION ZMSCH70242 is a Dash 242 Buna-N (Nitrile Butadiene Rubber) O-ring with a round cross section, designed for sealing applications across plumbing, HVAC, and fluid-handling systems. It measures 4 inches inside diameter, 4.25 inches outside diameter, and 0.125 inches thick. With a Shore A hardness of 70, this O-ring provides a firm, reliable seal under compression. The material offers excellent resistance to petroleum-based fluids, strong compression set performance, and good tear and abrasion resistance. Rated for service from -40 degrees F to 250 degrees F, it suits a broad range of temperature environments encountered in mechanical trade work.

This O-ring is commonly used in pumps, valves, pipe fittings, and fluid-transfer equipment where petroleum-based media compatibility is required. It is appropriate for residential and light commercial HVAC, plumbing, and pool equipment service. The Dash 242 designation corresponds to a widely standardized size, making it a routine replacement in many service scenarios. Each order is fulfilled in a package quantity of 50 units, well suited for service contractors who stock common O-ring sizes in their field inventory.

Key Features

• Buna-N elastomer with excellent resistance to petroleum products, oils, and fuels
• Round cross section, 0.125 inches thick, Dash 242 standard size
• 70 Shore A hardness rating for firm compression sealing
• Operating temperature range: -40 degrees F to 250 degrees F
• Meets SAE and MIL-Spec standards
• Sold in a package of 50 units to support high-volume service work

Compatibility

Compatible with petroleum-based products and related fluid systems. Designed as an OEM-style replacement O-ring for any application requiring a Dash 242 Buna-N seal with a 4-inch inside diameter and 0.125-inch cross section thickness.

Installation Notes

Installation is performed by licensed plumbers, HVAC technicians, or pool service professionals depending on the application. Always depressurize and isolate the system before removing or installing O-rings. Inspect the groove and mating surfaces for damage or debris before seating the new O-ring. Avoid storing unused O-rings in direct sunlight or near motors and electrical equipment that may generate ozone, as this can degrade the elastomer over time.