Value Collection ZMSCS70348 Silicone O-ring Dash 348 5-pack

Product Description

The VALUE COLLECTION ZMSCS70348 is a round cross-section silicone O-ring used as a static or dynamic seal in fluid and gas systems across plumbing, HVAC, and industrial service applications. It carries a 4.375-inch inside diameter, a 4.75-inch outside diameter, and a 0.1875-inch thickness corresponding to Dash 348 sizing. Shore hardness is rated at 70, placing it in the hard category. Each package contains 5 O-rings. Silicone compound delivers reliable sealing performance across a wide temperature range, making this ring a practical choice for service calls where heat cycling or outdoor exposure is a factor.

This O-ring is suited for residential and light commercial applications where the sealing point sees elevated or sub-zero temperatures. It performs in dry-heat environments and resists weather and ozone degradation, making it appropriate for rooftop HVAC equipment, outdoor plumbing connections, and similar exposed installations. The silicone compound provides limited oil resistance, so it is best applied in chemical, solvent, or dry-gas service rather than direct petroleum-oil contact. Plumbers, HVAC technicians, and mechanical contractors are the primary installers.

Key Features

• Dash 348 standard sizing: 4.375 inches ID, 4.75 inches OD, 0.1875 inches thick
• Silicone compound rated from -80 degrees F to 450 degrees F
• Shore 70 hardness for firm, consistent compression sealing
• Good weather and ozone resistance for outdoor and rooftop service
• Round cross-section for use in standard O-ring grooves
• Sold in a pack of 5 to support multi-unit service calls

Compatibility

Designed as a standard Dash 348 replacement O-ring compatible with any groove machined to Dash 348 dimensions per standard O-ring sizing conventions. Suitable for sealing applications involving chemicals, solvents, and non-petroleum-based fluids where silicone compound is appropriate.

Installation Notes

Shut off fluid supply and relieve system pressure before removing or replacing any O-ring. Clean the mating groove and sealing surfaces to remove debris, old sealant, or remnants of the previous O-ring before installing the new part. Apply a compatible lubricant approved for use with silicone elastomers to ease installation and prevent pinching or tearing. Verify silicone compound compatibility with the specific fluid or gas in the system before installation, as silicone offers limited resistance to petroleum-based oils.