Value Collection ZMSCHB90113 Backup Ring Dash 8-113 Nbr

Product Description

The VALUE COLLECTION ZMSCHB90113 is a Dash 8-113 backup ring O-ring manufactured from Nitrile Butadiene Rubber (NBR) with a rectangular cross section. It measures 0.577 inches inside diameter, 0.75 inches outside diameter, and 0.0468 inches thick. Rated at 90 durometer, this extra-hard ring is designed to prevent O-ring extrusion under pressure in hydraulic, pneumatic, and fluid-sealing applications. Licensed plumbers, HVAC technicians, and mechanical service professionals install these rings as secondary seals alongside primary O-rings in grooved gland assemblies. The NBR compound provides broad chemical compatibility with petroleum-based fluids and refrigerant oils.

This backup ring is suited for residential and light commercial plumbing, HVAC refrigerant circuits, and general fluid-handling systems where O-ring extrusion is a concern. Its rectangular cross section seats positively in standard gland grooves, making it appropriate for use in valve bodies, fittings, cylinders, and other threaded or flanged connections that see dynamic or static sealing loads. The Dash 8-113 designation identifies the dimensional standard, allowing straightforward cross-reference and replacement ordering. Each package contains 100 rings, with a minimum order quantity of 1 package.

Key Features

• Dash 8-113 rectangular backup ring profile prevents O-ring extrusion under pressure
• 90 durometer extra-hard NBR compound resists deformation in high-pressure gland assemblies
• Operating temperature range of -40 to 250 degrees F suits refrigeration and hot-fluid service
• Rectangular cross section for positive, predictable seating in standard gland grooves
• Nitrile Butadiene Rubber construction compatible with petroleum-based oils and common hydraulic fluids
• Package quantity of 100 supports service fleet and shop inventory needs

Compatibility

Designed as an OEM-style replacement backup ring for standard Dash 8-113 gland applications in hydraulic, pneumatic, plumbing, and HVAC fluid-sealing assemblies.

Installation Notes

Installation should be performed by a qualified plumber, HVAC technician, or mechanical technician. Always depressurize and isolate the system before disassembling any gland or fitting. Inspect the gland groove for wear or damage before seating the backup ring, and ensure the ring is fully seated against the low-pressure side of the groove before reassembling. Avoid stretching or twisting the ring during installation to prevent set and premature failure.