Value Collection ZMSCS70143 Silicone O-ring Dash 143

Product Description

The VALUE COLLECTION ZMSCS70143 is a Dash 143 silicone O-ring designed for static and dynamic sealing applications across a broad temperature range. With a 2.438-inch inside diameter, a 2.625-inch outside diameter, and a cross-section thickness of 0.094 inches, this round-profile ring seats reliably in standard Dash 143 grooves. The silicone compound carries a Shore A hardness rating of 70, balancing flexibility and compression resistance. It performs from -80 degrees F to 450 degrees F, making it well suited for applications where wide thermal cycling, dry heat exposure, or outdoor weathering are concerns. Each package contains 10 rings.

This O-ring is appropriate for plumbing, HVAC, pool and spa equipment, and general industrial assemblies where the sealing surface contacts oils, chemicals, or solvents at moderate concentrations. The silicone material provides good resistance to ozone and weather degradation, which makes it a practical choice for outdoor or exposed mechanical joints. Licensed plumbers, HVAC technicians, and pool equipment service professionals commonly use Dash 143 O-rings when servicing valves, fittings, pumps, and filter housings. Note that oil resistance is limited compared to nitrile compounds; verify fluid compatibility before installation.

Key Features

• Dash 143 standard sizing: 2.438 inches ID x 2.625 inches OD x 0.094 inches thick
• Silicone compound rated for -80 degrees F to 450 degrees F continuous service
• Shore A 70 hardness for firm, reliable groove seating
• Round cross-section for uniform compression and consistent sealing
• Good ozone and weather resistance for outdoor or exposed installations
• Packaged in quantities of 10 for service stock or repair kits

Compatibility

Designed as a standard Dash 143 O-ring replacement for any groove or port machined to Dash 143 dimensions per AS568 standard sizing. Verify groove depth and cross-section clearance before installation. Compatible with oils, chemicals, and solvents at moderate exposure levels; limited oil resistance relative to nitrile elastomers.

Installation Notes

Installation should be performed by a qualified technician familiar with the system being serviced. Depressurize and isolate the system before removing any existing seals. Lightly lubricate the O-ring with a compatible grease or fluid before seating to prevent tearing during assembly. Do not roll or twist the ring into the groove; seat it evenly by hand to avoid setting stress that can cause premature failure.