Value Collection ZMSCH90157 O-ring 4.5 in Id Dash 157

Product Description

The VALUE COLLECTION ZMSCH90157 is a Dash 157 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in fluid-sealing applications. It measures 4.5 inches inside diameter, 4.688 inches outside diameter, and 0.094 inches thick with a round cross section. Rated at 90 durometer (extra hard), this O-ring delivers excellent compression set resistance along with strong tear and abrasion resistance. The temperature range spans -40 to 250 degrees F, making it suitable for a broad range of hydraulic, pneumatic, and plumbing sealing tasks. Plumbers, HVAC technicians, and industrial maintenance trades install this type of seal in fluid systems handling petroleum-based media.

This O-ring is suited for residential and commercial applications wherever a Dash 157 Buna-N seal is specified. Typical installation scenarios include hydraulic fittings, pump housings, valve bodies, and pipe flange connections that contact petroleum products, oils, and fuels. The Buna-N compound provides excellent resistance to petroleum-based fluids, making it a reliable choice in fuel systems, hydraulic circuits, and general plumbing assemblies that require a durable static or dynamic seal in this size range.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction with excellent petroleum product resistance
• 90 durometer extra-hard rating for demanding compression and sealing applications
• Operating temperature range of -40 to 250 degrees F
• Round cross section, Dash 157 standard sizing
• Meets SAE and MIL-Spec standards
• Strong tear and abrasion resistance for extended service life

Compatibility

Compatible with petroleum products and systems requiring a Dash 157 Buna-N O-ring per SAE and MIL-Spec standards. Not recommended for use in ozone-rich environments or where exposure to direct sunlight or electrical equipment generating ozone is present. FDA approval does not apply to this part.

Installation Notes

Installation should be performed by a qualified plumber, hydraulic technician, or HVAC service professional following applicable codes and system specifications. Shut down and depressurize the system fully before removing the old seal or installing the replacement. Avoid storing Buna-N O-rings near motors, electrical equipment, or in direct sunlight, as ozone exposure degrades nitrile rubber. Inspect the mating groove for damage or contamination before seating the new O-ring.