Value Collection ZMSCHB90228 O-ring Dash 8-228 Nbr 90D

Product Description

The VALUE COLLECTION ZMSCHB90228 is a rectangular-cross-section backup O-ring designed to prevent extrusion and seal failure in high-pressure fluid systems. Manufactured from Nitrile Butadiene Rubber (NBR) with a 90 durometer hardness rating, this extra-hard backup ring seats behind a primary O-ring to maintain seal integrity under elevated pressure and temperature cycling. The ring measures 2.147 inches inside diameter, 2.383 inches outside diameter, and 0.0468 inches thick. It is rated for service from -40 to 250 degrees F, making it suitable for hydraulic, pneumatic, and fluid-handling assemblies encountered in HVAC, plumbing, and mechanical systems. Plumbers, HVAC technicians, and hydraulic system technicians are the primary installers of this component.

This backup ring is used in applications where standard O-rings alone cannot resist extrusion into clearance gaps under high pressure. Common install scenarios include hydraulic cylinder rod and piston grooves, pump housings, valve bodies, and high-pressure fittings. The Dash 8-228 designation corresponds to a standard AS568 O-ring groove size, allowing straightforward groove matching in existing assemblies. NBR construction provides good resistance to petroleum-based oils, fuels, and hydraulic fluids, making this ring appropriate for commercial and industrial mechanical systems as well as residential plumbing and HVAC refrigerant-side or water-side components where NBR compatibility is confirmed.

Key Features

• Rectangular cross-section provides backup support to primary O-ring seals, resisting extrusion under pressure
• 90 durometer extra-hard NBR compound delivers firm seating and dimensional stability
• Operating temperature range of -40 to 250 degrees F suits a wide range of fluid-system environments
• Dash 8-228 sizing matches standard AS568 O-ring groove dimensions for direct replacement fitment
• NBR material offers solid resistance to petroleum oils, hydraulic fluids, and water-based media
• Sold in packages of 25 units, suitable for service fleet stocking or job-site quantity needs

Compatibility

Designed as an OEM-style replacement or service backup ring for any hydraulic, pneumatic, or fluid-handling assembly specifying a Dash 8-228 rectangular-cross-section backup ring in Nitrile Butadiene Rubber. Confirm NBR chemical compatibility with the specific fluid media before installation.

Installation Notes

Power down or depressurize the system completely before disassembling any seal or fitting. Install backup rings using clean, lubricated fingers or a blunt plastic installation tool — never use sharp or metal tools that can nick the ring. Ensure the backup ring seats flat in the groove on the low-pressure side of the primary O-ring. Follow applicable system manufacturer service procedures and relevant plumbing or mechanical codes for your jurisdiction.