Value Collection ZMSCH90156 O-ring Dash 156 Buna-n 90 Duro

Product Description

The VALUE COLLECTION ZMSCH90156 is a Dash 156 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in fluid sealing applications. It measures 4.25 inches inside diameter, 4.438 inches outside diameter, and 0.094 inches thick, with a round cross-section profile. Rated at 90 durometer (extra hard), it provides excellent compression set resistance along with strong tear and abrasion resistance. The temperature range runs from -40 degrees F to 250 degrees F, making it suitable for a broad range of service environments. Plumbers, HVAC technicians, and mechanical maintenance trades install these in hydraulic, pneumatic, and fluid-handling systems.

This O-ring is suited for use in residential and commercial systems where petroleum-based fluid sealing is required. Buna-N compound offers excellent resistance to petroleum products, including oils, fuels, and hydraulic fluids, making it a standard choice for pumps, valves, cylinders, and pipe fittings across HVAC, plumbing, and light industrial applications. The package includes 25 O-rings per unit, with a minimum order quantity of 1 package.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction with excellent petroleum product resistance
• 90 durometer extra hard rating for high-compression sealing applications
• Operating temperature range: -40 degrees F to 250 degrees F
• Round cross-section profile per Dash 156 standard sizing
• Compliant with SAE and MIL-Spec standards
• Resistant to tear, abrasion, and compression set

Compatibility

Compatible with petroleum-based products and fluids. Designed as a standard Dash 156 replacement O-ring for use in pumps, valves, cylinders, and fittings that call for Buna-N compound seals within the specified temperature range.

Installation Notes

Installation should be performed by a qualified plumber, HVAC technician, or mechanical trades professional. Depressurize and isolate the system before removing the existing seal or fitting. Avoid rolling or twisting the O-ring during installation, and do not expose it to direct sunlight, ozone sources, or electrical equipment during storage, as these conditions degrade Nitrile rubber over time. Consult applicable codes such as the IPC or IFGC depending on the system type and jurisdiction.