Value Collection ZMSCTFE338 Ptfe O-ring Dash 338 5 Pack

Product Description

The VALUE COLLECTION ZMSCTFE338 is a Dash 338 PTFE O-ring designed for static and dynamic sealing applications that demand chemical resistance and wide temperature tolerance. Manufactured from white polytetrafluoroethylene resin, it measures 3.125 inches inside diameter, 3.500 inches outside diameter, and 0.1875 inches (3/16 inches) thick with a round cross section. The material delivers chemical inertness, low friction, zero water absorption, and dielectric strength across a service range of -300 degrees F to 500 degrees F. Each package contains 5 O-rings. This part is handled and installed by licensed plumbers, pipefitters, HVAC technicians, and industrial maintenance trades.

This O-ring suits sealing applications in fluid handling, chemical processing, HVAC refrigerant circuits, and industrial piping where aggressive media or extreme temperatures rule out standard rubber compounds. The PTFE construction resists nearly all chemicals and solvents, making it a common choice for high-purity, corrosive-fluid, or high-temperature service environments. The medium hardness rating supports reliable compression sealing in grooved or flanged face-seal configurations. Sold in a 5-piece pack to support single-job service or parts-stock use.

Key Features

• PTFE (polytetrafluoroethylene) construction for broad chemical inertness and high-temperature stability
• Service temperature range of -300 degrees F to 500 degrees F
• Round cross section with Dash 338 sizing: 3.125 inches ID, 3.500 inches OD, 0.1875 inches thick
• Medium hardness (55) supports consistent compression in standard O-ring groove profiles
• Zero water absorption and weatherability extend service life in wet or outdoor environments
• Sold as a 5-piece pack (minimum order quantity of 1 pack)

Compatibility

Designed as an OEM-style replacement or maintenance-stock O-ring for any application requiring a Dash 338 PTFE seal with 3.125 inches ID and 3.500 inches OD dimensions.

Installation Notes

Installation should be performed by a qualified plumber, pipefitter, or HVAC technician following applicable IPC or IFGC guidelines. Depressurize and isolate the system before removing the existing O-ring. Inspect the mating groove and sealing surface for nicks, scoring, or debris before seating the new ring. Do not use petroleum-based lubricants with PTFE O-rings; consult the system manufacturer for compatible assembly lubricants.