Value Collection ZMSCH70240 O-ring 3.75 in Id Nbr Dash 240

Product Description

The VALUE COLLECTION ZMSCH70240 is a Dash 240 Nitrile Butadiene Rubber (NBR) O-ring designed for static and dynamic sealing applications in plumbing, HVAC, and fluid-handling systems. It measures 3.75 inches inside diameter and 4 inches outside diameter with a 0.125-inch round cross section and a Shore hardness of 70. NBR is the most widely used O-ring elastomer due to its excellent resistance to petroleum-based fluids, strong compression set characteristics, and solid tear and abrasion resistance. Licensed trades and maintenance technicians install this type of seal when servicing valves, pumps, fittings, and other fluid-handling components where petroleum product exposure is a factor.

This O-ring is suited for residential and commercial applications where the sealing environment involves petroleum products, hydraulic fluids, or similar media. It carries ratings for both SAE and MIL-Spec standards, making it appropriate for a broad range of mechanical and fluid-system service work. Operating temperature range spans -40 degrees F to 250 degrees F, covering most HVAC, plumbing, and light industrial service conditions. Sold in a package quantity of 50, this O-ring is practical for stocking service vehicles or shop inventory. Note that NBR should not be stored in direct sunlight or near motors or electrical equipment that may generate ozone.

Key Features

• Nitrile Butadiene Rubber (Buna-N) construction — excellent resistance to petroleum products and hydraulic fluids
• 3.75 inches ID x 4 inches OD x 0.125 inches thick, Dash 240 sizing
• Shore hardness 70 with round cross section for reliable compression set
• Operating range of -40 degrees F to 250 degrees F
• Meets SAE and MIL-Spec standards
• Packaged in quantities of 50 for shop or field stocking

Compatibility

Compatible with petroleum products and similar media. Designed as a standard Dash 240 O-ring replacement suitable for valves, pumps, fittings, and fluid-handling assemblies requiring a 3.75-inch ID NBR seal conforming to SAE and MIL-Spec standards.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or qualified maintenance personnel. Always depressurize and de-energize the system and drain fluid from the affected line or component before removing the existing O-ring. Lubricate the new O-ring with a compatible fluid or O-ring lubricant prior to seating to prevent nicking or rolling during assembly. Do not use petroleum-incompatible lubricants or stretch the O-ring beyond its designed groove dimensions.