Value Collection TES70121 O-ring Dash 121 Ptfe Silicone

Product Description

The VALUE COLLECTION TES70121 is a Dash 121 PTFE-encapsulated silicone o-ring designed for static and dynamic sealing applications across plumbing, HVAC, and fluid-handling systems. It measures 1.063 inches inner diameter by 1.25 inches outer diameter with a cross-section thickness of 0.094 inches. The round cross-section design features seamless, uniform FEP-Teflon encapsulation that fully encloses a silicone elastomer core. This construction delivers the chemical and temperature resistance of solid PTFE while retaining the elasticity and recovery properties of silicone. The rated temperature range spans -75 degrees F to 400 degrees F, making it suitable for demanding service environments. Licensed plumbers, pipefitters, and HVAC technicians are the typical installers.

This o-ring is suited for use in fluid and gas sealing applications where exposure to aggressive chemicals, wide temperature swings, or media incompatible with standard nitrile or EPDM elastomers is a concern. Common install scenarios include pump flanges, valve stems, fittings, and chemical-handling connections in both residential and light commercial systems. The Dash 121 designation follows standard AS568 sizing and allows straightforward cross-reference to OEM and aftermarket groove specifications.

Key Features

• FEP-Teflon encapsulation provides chemical resistance equivalent to solid PTFE o-rings
• Silicone elastomer core delivers flexibility and elastic recovery across a wide temperature range
• Rated from -75 degrees F to 400 degrees F for use in demanding thermal environments
• Seamless, uniform encapsulation prevents media ingress at the seam
• 70 durometer hardness rating suitable for standard groove tolerances
• Round cross-section conforms to AS568 Dash 121 dimensional standard

Compatibility

Designed as a standard AS568 Dash 121 replacement o-ring for use in any groove machined to accept a 1.063-inch ID by 1.25-inch OD by 0.094-inch cross-section seal.

Installation Notes

Installation is typically performed by licensed plumbers, pipefitters, or HVAC technicians. De-energize and depressurize the system fully before removing the existing seal. Inspect the mating groove for burrs, scoring, or contamination before seating the replacement ring. Avoid using petroleum-based lubricants with PTFE-encapsulated seals; consult the system manufacturer for compatible assembly lubricants.