Value Collection ZMSCS70243 Silicone O-ring Dash 243 5 Pack

Product Description

The VALUE COLLECTION ZMSCS70243 is a round cross-section silicone O-ring sized to Dash 243, with an inside diameter of 4.125 inches, an outside diameter of 4.375 inches, and a thickness of 0.125 inches. Rated at 70 Shore A hardness, this O-ring is engineered for sealing applications that demand a wide service temperature range, spanning from -80 degrees F to 450 degrees F. The silicone compound provides good resistance to dry heat, weathering, and ozone, making it a dependable sealing element in systems where thermal cycling and outdoor exposure are ongoing concerns. Each package contains 5 pieces.

This O-ring is suited for use in HVAC systems, plumbing assemblies, pool and spa equipment, and general industrial sealing applications where silicone is a specified or compatible material. It performs well in environments involving exposure to oils, chemicals, and solvents within its resistance limits, though users should note it carries limited resistance to petroleum-based oils under pressure. Licensed HVAC technicians, plumbers, and maintenance professionals commonly use Dash 243 O-rings when servicing larger-diameter fittings, valves, manifolds, and pump housings.

Key Features

• Silicone material rated for -80 degrees F to 450 degrees F service temperature range
• Round cross-section profile at 0.125 inches thick for consistent seating in standard grooves
• 70 Shore A hardness for firm, reliable compression sealing
• Good weather and ozone resistance for outdoor or exposed installations
• Compatible with oils, chemicals, and solvents within rated limits
• Sold in a 5-piece package to support stocking and repeat service calls

Compatibility

Designed as a standard Dash 243 O-ring replacement for any application specifying a 4.125-inch ID, 4.375-inch OD, 0.125-inch thick round cross-section silicone seal.

Installation Notes

Installation should be performed by a qualified technician following applicable mechanical and plumbing codes. Always depressurize and, where applicable, shut off fluid supply before removing or installing O-rings. Inspect the groove and mating surfaces for damage or debris before seating the new O-ring. Avoid twisting or stretching the O-ring during installation, as distortion can compromise the seal.