Value Collection ZMSCS70321 Silicone O-ring Dash 321

Product Description

The VALUE COLLECTION ZMSCS70321 is a silicone O-ring with a round cross section, designed for static and dynamic sealing applications across HVAC, plumbing, and industrial fluid systems. It measures 1.188 inches inside diameter, 1.563 inches outside diameter, and 0.1875 inches thick, conforming to Dash 321 sizing standards. Rated for a working temperature range of -80 degrees F to 450 degrees F, this ring is well suited for systems exposed to wide thermal swings or sustained dry heat. Durometer hardness is rated at 70, placing it in the hard hardness category. Each order is sold in a package of 10 rings.

This O-ring is used in residential and commercial applications where sealing against oils, chemicals, and solvents is required. It is particularly appropriate for HVAC equipment, refrigeration piping, plumbing fittings, and general industrial assemblies that demand good weather and ozone resistance. Installers choose silicone compound for environments with high ambient heat or outdoor exposure. The Dash 321 designation allows cross-referencing against standard O-ring sizing charts for quick identification during service and repair work.

Key Features

• Silicone compound rated from -80 degrees F to 450 degrees F for wide-temperature applications
• Dash 321 standard sizing: 1.188 inches ID, 1.563 inches OD, 0.1875 inches thick
• Round cross section for consistent seating in standard O-ring grooves
• Hardness of 70 durometer for reliable compression and seal retention
• Resistant to weather, ozone, and a broad range of chemicals and solvents
• Sold in a pack of 10 to support service inventory and job-site stocking

Compatibility

Designed as a standard Dash 321 silicone O-ring replacement suitable for any application requiring a 1.188-inch ID, 1.563-inch OD, 0.1875-inch thick round cross-section seal in a silicone-compatible groove.

Installation Notes

Power down or isolate the system and relieve all pressure before replacing O-rings in fluid or gas circuits. Inspect the groove for wear, scoring, or debris prior to seating the new ring. Lubricate the O-ring with a compatible silicone-based lubricant to ease installation and prevent tearing during assembly. Note that silicone compound offers limited oil resistance, so confirm suitability with the system fluid before installation.