Value Collection ZMSCH70346 O-ring Dash 346 Nitrile 70A

Product Description

The VALUE COLLECTION ZMSCH70346 is a Dash 346 O-ring made from Nitrile Butadiene Rubber (Buna-N), one of the most widely used elastomers in fluid sealing applications. It measures 4.125 inches inside diameter and 4.500 inches outside diameter with a 0.1875-inch round cross section and a Shore A hardness rating of 70. This O-ring delivers excellent resistance to petroleum-based fluids, strong compression set performance, and good tear and abrasion resistance. It is installed by licensed plumbers, HVAC technicians, and mechanical contractors working on hydraulic, pneumatic, and fluid-handling systems.

This O-ring is suited for use in residential and commercial applications where petroleum-product compatibility is required. Typical installations include pump housings, valve bodies, pipe flanges, and hydraulic fittings. It performs across a wide temperature range of -40 degrees F to 250 degrees F, making it appropriate for both indoor mechanical rooms and outdoor service environments. The black Buna-N compound is the standard choice for fuel oil, hydraulic fluid, and water service sealing tasks common in HVAC and plumbing trade work.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound with excellent petroleum product resistance
• 4.125 inches ID x 4.500 inches OD with a 0.1875-inch round cross section
• 70 Shore A hardness for reliable compression set and sealing force
• Operating temperature range: -40 degrees F to 250 degrees F
• Meets SAE and MIL-Spec standards
• Round cross section, Dash 346 designation for standard groove fitment

Compatibility

Compatible with petroleum products and hydraulic fluids. Designed as a standard Dash 346 O-ring replacement for grooves sized to accept a 4.125-inch ID round-cross-section seal in plumbing, HVAC, and fluid-power applications.

Installation Notes

Installation should be performed by a qualified plumber, HVAC technician, or pipefitter. Shut off system pressure and drain fluid before removing the old O-ring. Lightly lubricate the O-ring with a compatible fluid or grease before seating to prevent pinching or tearing during assembly. Do not store O-rings in direct sunlight or near motors or other electrical equipment that may generate ozone, as this degrades the elastomer over time.