Value Collection ZMSCS70242 Silicone O-ring Dash 242 5-pack

Product Description

The VALUE COLLECTION ZMSCS70242 is a Dash 242 silicone O-ring designed for static and dynamic sealing applications across HVAC, plumbing, and industrial service work. It measures 4 inches inside diameter, 4-1/4 inches outside diameter, and 1/8 inch thick with a round cross section. The white silicone compound carries a Shore A hardness of 70 and is rated for service from -80 degrees F to 450 degrees F, making it suitable where wide temperature swings and dry heat resistance are required. Licensed technicians and trade plumbers reach for silicone compound when standard nitrile falls short of thermal or ozone exposure demands.

This O-ring is used in residential and commercial applications where the sealing surface contacts oils, chemicals, or solvents at elevated or sub-zero temperatures. Typical install scenarios include pump housings, valve bodies, compressor end caps, and pipe flanges that see thermal cycling. The round cross section seats cleanly in standard Dash 242 grooves. Each package contains 5 rings, sold in multiples of 1 package.

Key Features

• Silicone compound rated -80 degrees F to 450 degrees F for wide-range thermal service
• Dash 242 standard sizing: 4 inches ID, 4-1/4 inches OD, 1/8 inch cross section
• Shore A 70 hardness for a firm, reliable seat in standard grooves
• Good weather and ozone resistance for outdoor and exposed installations
• Compatible with oils, chemicals, and solvents in typical trade applications
• Round cross section for consistent compression and groove fit

Compatibility

Designed as a standard Dash 242 O-ring replacement for any application requiring a 4-inch ID silicone seal with a round cross section, including pump housings, valve bodies, and flanged connections in HVAC, plumbing, and light industrial systems.

Installation Notes

Power down or isolate the system and relieve all pressure before removing the existing O-ring. Inspect the groove for nicks, corrosion, or debris that could cause the new ring to extrude or leak. Silicone O-rings should be installed dry or with a silicone-compatible lubricant only — petroleum-based greases can degrade the compound over time. Installation is typically performed by licensed HVAC technicians, journeyman plumbers, or qualified mechanical contractors in accordance with applicable codes.