Value Collection ZMSCHB90219 Nbr O-ring Backup Ring

Product Description

The VALUE COLLECTION ZMSCHB90219 is a rectangular-cross-section backup O-ring made from Nitrile Butadiene Rubber (NBR) with a 90 durometer extra-hard rating. It measures 1.332 inches inside diameter, 1.563 inches outside diameter, and 0.0468 inches thick. Rated for continuous service from -40 to 250 degrees F, this backup ring is designed to prevent O-ring extrusion under pressure in hydraulic and pneumatic assemblies. HVAC technicians, plumbers, and fluid-system mechanics use this style of backup ring wherever primary seals must be supported against gap extrusion in dynamic or static sealing applications.

This backup ring is suited for use in residential and light commercial fluid-handling systems, including hydraulic valve bodies, pneumatic cylinders, refrigerant-side fittings, and plumbing connection points that require dimensional backup support. The Dash 8-219 designation aligns it with standard O-ring sizing references, making cross-referencing to existing system seal kits straightforward. It is packaged in a quantity of 50 per package with a minimum order quantity of 1, making it practical for both single-repair service calls and stock replenishment.

Key Features

• Rectangular cross-section profile functions as a backup ring to prevent primary O-ring extrusion
• 90 durometer extra-hard NBR construction resists deformation under pressure
• Operating temperature range of -40 to 250 degrees F suits a wide range of HVAC, plumbing, and hydraulic environments
• Dash 8-219 sizing designation for straightforward cross-referencing with standard seal catalogs
• Package quantity of 50 supports both job-site repairs and shop inventory stocking

Compatibility

Designed as a standard Dash 8-219 backup ring for use alongside matching primary O-rings in hydraulic, pneumatic, and fluid-system assemblies requiring extrusion prevention at grooved seal points.

Installation Notes

Backup rings are installed by qualified HVAC technicians, plumbers, or hydraulic system mechanics. Always depressurize and isolate the fluid system before disassembling any seal cavity. Install the backup ring on the low-pressure side of the primary O-ring within the groove. Avoid twisting or spiraling the ring during installation to preserve its rectangular cross-section and sealing support geometry.