Value Collection ZMSCS70240 Silicone O-ring Dash 240 5-pack

Product Description

The VALUE COLLECTION ZMSCS70240 is a Dash 240 silicone O-ring sold in a pack of 5. It features a round cross section with a 3.75-inch inside diameter, 4-inch outside diameter, and a thickness of 0.125 inches. Rated at 70 Shore A hardness, this O-ring is formulated for wide temperature range service, rated from -80 degrees F to 450 degrees F. It carries good resistance to dry heat, weather, and ozone. Licensed plumbers, HVAC technicians, and industrial maintenance professionals install these as static or low-motion seals in fluid and gas systems.

This O-ring is suited for applications requiring broad thermal tolerance and reliable sealing against oils, chemicals, and solvents. Silicone compound makes it a common choice in HVAC, refrigeration, plumbing, and general industrial assemblies where temperature extremes or outdoor exposure are concerns. Note that this compound has limited oil resistance compared to Buna-N or Viton, so confirm compatibility with your specific fluid media before installation. Each order ships as a pack of 5 individual O-rings.

Key Features

• Dash 240 size: 3.75 inches ID, 4 inches OD, 0.125 inches thick
• Silicone compound rated from -80 degrees F to 450 degrees F
• 70 Shore A hardness rating for firm, reliable sealing
• Good weather and ozone resistance for outdoor or exposed installations
• Compatible with oils, chemicals, and solvents in appropriate concentrations
• Round cross section for use in standard O-ring groove profiles

Compatibility

Designed as a standard Dash 240 O-ring replacement for any application calling for a 3.75-inch ID silicone seal with a 0.125-inch cross section. Verify groove dimensions and fluid compatibility before installation.

Installation Notes

Power down or depressurize the system completely before replacing any O-ring seal. Clean the mating groove of debris and inspect for surface damage that could compromise the seal. Apply a compatible lubricant sparingly to ease seating without overstretching the O-ring. Silicone O-rings should not be used with silicone-based greases or fluids, as these can cause swelling and seal failure.