Value Collection ZBD9993-21 O-ring Dash 248 Nitrile

Product Description

The VALUE COLLECTION ZBD9993-21 is a Dash 248 O-ring manufactured from Nitrile Butadiene Rubber (NBR) with a round cross section. It measures 4.75 inches inside diameter, 5 inches outside diameter, and 0.125 inches thick. With a Shore A hardness rating of 70 (Hard), this O-ring is suited for sealing applications that demand moderate flexibility and resistance to oils, fuels, and hydraulic fluids. Licensed plumbers, HVAC technicians, and industrial maintenance technicians typically install this component in fluid-handling and pneumatic systems where a reliable static or dynamic face seal is required.

This O-ring is appropriate for use in residential and commercial plumbing, HVAC refrigerant circuits, hydraulic assemblies, and general industrial fluid systems. Its NBR compound performs across a wide temperature range, from -40 degrees F to 275 degrees F, making it serviceable in both chilled-water and moderate-temperature hot-water or steam-adjacent applications. It is sold individually with a minimum order quantity of 10 units.

Key Features

• Nitrile Butadiene Rubber (NBR) compound resists oils, fuels, and hydraulic fluids
• Round cross section provides consistent sealing contact around the full groove perimeter
• 70 Shore A hardness (Hard rating) balances compression set resistance with conformability
• Operating temperature range of -40 degrees F to 275 degrees F covers most HVAC and plumbing service conditions
• Dash 248 standard sizing ensures drop-in fitment wherever a Dash 248 O-ring groove is specified

Compatibility

Designed as a standard Dash 248 replacement O-ring for any application requiring a 4.75-inch ID, 5-inch OD, 0.125-inch cross section NBR seal. Verify groove dimensions and fluid compatibility before installation.

Installation Notes

Shut off and depressurize the system completely before removing the existing O-ring. Inspect the groove for nicks, corrosion, or debris that could compromise the new seal. Apply a light coat of compatible lubricant to the O-ring before seating it in the groove to prevent tearing during assembly. Installations in refrigerant or pressurized gas circuits should be performed by a licensed technician in accordance with applicable codes.