Value Collection ZMSCH90342 O-ring 3.625 in Id Nbr Dash 342

Product Description

The VALUE COLLECTION ZMSCH90342 is a Dash 342 Buna-N (Nitrile Butadiene Rubber) O-ring used to create pressure-tight seals in fluid and pneumatic systems across HVAC, plumbing, and industrial applications. It measures 3.625 inches inside diameter, 4 inches outside diameter, and 0.1875 inches thick with a round cross section. Rated at 90 durometer (extra hard), this O-ring handles a working temperature range of -40 to 250 degrees F. It is installed by HVAC technicians, plumbers, and mechanical contractors wherever a reliable static or dynamic seal is required. Sold in a package of 25.

This O-ring is suited for use in residential and commercial systems where petroleum-based fluids, hydraulic oils, or compressed air are present. Typical installation scenarios include compressor fittings, valve stems, pump housings, and pipe unions. The Buna-N compound is the most widely used O-ring elastomer and performs consistently in applications involving petroleum products. The extra-hard 90 durometer rating makes it appropriate for higher-pressure connections where softer compounds would extrude or deform under load.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound with excellent resistance to petroleum products
• 90 durometer extra-hard rating resists extrusion and deformation under pressure
• Working temperature range: -40 to 250 degrees F
• Round cross section, 0.1875 inches thick, conforms to Dash 342 sizing standard
• Meets SAE and MIL-Spec standards
• Package quantity of 25 units per order

Compatibility

Compatible with petroleum products and systems where Buna-N elastomer is specified. Designed as a standard Dash 342 replacement O-ring for any fitting, valve, or housing calling out that dash size. Not recommended for use with ozone-generating equipment or in direct sunlight storage conditions. FDA approval has not been established for this part.

Installation Notes

Installation is performed by licensed HVAC technicians, plumbers, or mechanical contractors depending on the application. Always depressurize and isolate the system before removing or replacing any O-ring seal. Inspect the mating groove for nicks, corrosion, or debris before seating the new ring. Avoid storing Buna-N O-rings near motors, electrical equipment, or in direct sunlight, as ozone and UV exposure can degrade the elastomer over time.