Value Collection ZMSCH70385 O-ring Dash 385 Buna-n 70A

Product Description

The VALUE COLLECTION ZMSCH70385 is a Dash 385 Buna-N (Nitrile Butadiene Rubber) O-ring with a round cross section, designed for static and dynamic sealing applications in fluid and pneumatic systems. It measures 16 inches inside diameter, 16.375 inches outside diameter, and 0.1875 inches thick. The compound carries a 70 Shore A hardness rating, placing it in the hard range for NBR elastomers. Rated from -40 degrees F to 250 degrees F, this O-ring delivers reliable sealing performance in systems that handle petroleum-based fluids. It is installed by plumbers, HVAC technicians, pipefitters, and industrial maintenance mechanics across a wide range of trade applications.

This O-ring is suited for use in residential and commercial plumbing systems, HVAC equipment, hydraulic assemblies, and industrial fluid-handling components wherever a large-bore Dash 385 seal is required. The Buna-N compound makes it a go-to choice in any application involving petroleum products, oils, fuels, and many hydraulic fluids. It is not recommended for use with ozone, strong oxidizing agents, or ketone-based fluids. Meets SAE and MIL-Spec standards. Sold in a package quantity of 5.

Key Features

• Buna-N (NBR) elastomer - the most widely used O-ring material for petroleum product resistance
• 70 Shore A hardness - hard rating providing excellent compression set and dimensional stability
• Operating temperature range: -40 degrees F to 250 degrees F
• Round cross section, Dash 385 standard sizing
• Excellent tear and abrasion resistance for demanding service environments
• Meets SAE and MIL-Spec standards

Compatibility

Designed as an OEM-style replacement or service seal for large-bore plumbing, HVAC, hydraulic, and industrial fluid-handling systems requiring a Dash 385 Buna-N O-ring. Compatible with petroleum products, oils, and hydraulic fluids. Not FDA approved; not suitable for food-contact applications.

Installation Notes

Installation is typically performed by licensed plumbers, pipefitters, or HVAC technicians as part of routine maintenance or equipment repair. Shut down and depressurize the system completely before removing the old seal. Clean the groove thoroughly and inspect for damage before seating the new O-ring. Avoid storing O-rings in direct sunlight or near motors and other electrical equipment that may generate ozone, as this degrades NBR elastomers over time.