Value Collection ZMSCTST018 Ptfe O-ring Dash 018 25-pack

Product Description

The VALUE COLLECTION ZMSCTST018 is a Dash 018 polytetrafluoroethylene (PTFE) O-ring designed for static and dynamic sealing applications across HVAC, plumbing, refrigeration, and industrial fluid systems. It measures 0.768 inches inside diameter, 0.875 inches outside diameter, and 0.048 inches thick with a rectangular cross-section. The PTFE compound provides a hardness rating of 55 durometer and handles a wide service temperature range from -65 degrees F to 500 degrees F, making it suitable for both cryogenic and high-heat sealing environments. Each purchase includes a package of 25 O-rings. Installation is typically performed by licensed HVAC technicians, plumbers, or mechanical contractors.

This O-ring is suited for use in residential and commercial systems where chemical resistance, temperature extremes, or media compatibility rule out standard elastomeric compounds. Common applications include refrigerant line fittings, high-temperature water connections, chemical handling equipment, and compressed gas assemblies. The rectangular cross-section provides a stable, predictable seating profile in flat-face grooves. PTFE construction resists degradation from oils, solvents, acids, and common refrigerants, making the ZMSCTST018 a reliable choice for demanding service conditions.

Key Features

• PTFE material provides broad chemical resistance and low friction
• Service temperature range: -65 degrees F to 500 degrees F
• 55 durometer medium hardness for consistent compression and sealing
• Rectangular cross-section for stable seating in flat-face and step grooves
• Dash 018 standard sizing ensures cross-reference compatibility with groove charts
• Sold in a convenient 25-piece package

Compatibility

Designed as an OEM-style and aftermarket replacement O-ring for any application requiring a Dash 018 rectangular cross-section PTFE seal in static or low-dynamic sealing grooves.

Installation Notes

Installation should be performed by a qualified technician following the applicable mechanical or plumbing code for the system type. De-energize, depressurize, and drain or evacuate the system before replacing any O-ring seal. Inspect the seating groove for burrs, corrosion, or damage before installing the new O-ring. Avoid using petroleum-based lubricants with PTFE O-rings; use a compatible assembly lubricant appropriate for the media being sealed.