Value Collection ZMSCS70344 Silicone O-ring Dash 344 5 Pack

Product Description

The VALUE COLLECTION ZMSCS70344 is a Dash 344 silicone O-ring designed for static and dynamic sealing applications across HVAC, plumbing, and industrial systems. It measures 3.875 inches inside diameter, 4.25 inches outside diameter, and 0.1875 inches thick, with a round cross section. The silicone compound is rated from -80 degrees F to 450 degrees F, making it suitable for high-heat environments and wide temperature swing applications. Hardness is 70 Shore A. Each package contains 5 O-rings. Licensed trades and maintenance technicians install these in fluid handling, equipment flanges, and mechanical assemblies where heat and ozone resistance are priorities.

This O-ring is suited for residential and commercial applications involving oils, chemicals, and solvents at elevated or extreme low temperatures. Typical uses include sealing flanged connections, pump housings, valve bodies, and equipment access ports in HVAC, pool, and plumbing systems. The silicone material provides good dry heat and ozone resistance, though oil resistance is limited. This product is not FDA approved and should not be specified for food-contact applications.

Key Features

• Wide service temperature range: -80 degrees F to 450 degrees F
• Round cross section, Dash 344 standard sizing
• 70 Shore A hardness for firm, reliable compression sealing
• Compatible with oils, chemicals, and solvents
• Good weather and ozone resistance
• Sold in a 5-pack per package

Compatibility

Designed as a standard Dash 344 O-ring replacement for any application requiring a 3.875-inch ID, 4.25-inch OD, 0.1875-inch thick round cross-section silicone seal.

Installation Notes

Installation should be performed by a qualified technician familiar with the system being serviced. Depressurize and drain the system before removing or installing any seals. Inspect the groove and mating surfaces for damage or debris before seating the O-ring. Avoid twisting or rolling the O-ring during installation, and do not use petroleum-based lubricants with silicone compounds unless confirmed compatible with the system media.