Value Collection ZMSCS70221 Silicone O-ring Dash 221

Product Description

The VALUE COLLECTION ZMSCS70221 is a Dash 221 silicone O-ring designed for static and dynamic sealing applications across a broad service temperature range. Measuring 1.438 inches inside diameter, 1.688 inches outside diameter, and 0.125 inches thick, this round-cross-section ring is molded from white silicone with a Shore A hardness of 70. It is rated for continuous service from -80 degrees F to 450 degrees F, making it a reliable choice where wide thermal cycling or sustained dry heat resistance is required. Licensed trades and maintenance professionals install these rings in fluid handling, pneumatic, and HVAC equipment assemblies.

This O-ring is suited for residential and commercial applications that demand good weather and ozone resistance, including HVAC equipment, pumps, valves, and piping connections. It offers limited oil resistance and is compatible with oils, chemicals, and solvents in applications where the temperature range drives material selection over chemical resistance. The Dash 221 dimension is a standard AS568 size widely encountered in industrial and mechanical system maintenance. Each package contains 50 rings, supporting both single-job use and shop-stock replenishment.

Key Features

• Wide service temperature range: -80 degrees F to 450 degrees F for demanding thermal environments
• Round cross section, Dash 221 standard AS568 sizing at 1.438 inches ID and 1.688 inches OD
• Shore A hardness of 70 provides firm sealing compression under typical clamp loads
• White silicone construction with good weather and ozone resistance
• Compatible with oils, chemicals, and solvents where limited oil exposure is acceptable
• Packaged in quantities of 50, suitable for shop stock or multi-unit service calls

Compatibility

Designed as a standard Dash 221 O-ring replacement for any application calling for an AS568-221 silicone seal with a 1.438 inches ID, 1.688 inches OD, and 0.125 inches cross-section thickness.

Installation Notes

Installation is performed by licensed plumbers, HVAC technicians, and mechanical maintenance professionals. Always depressurize and de-energize the system before replacing any O-ring seal. Lubricate the ring lightly with a compatible, silicone-safe lubricant before seating to prevent tearing during assembly. Inspect the groove for burrs or contamination before installation to ensure a proper seal.