Value Collection ZMSCS70349 Silicone O-ring Dash 349

Product Description

The VALUE COLLECTION ZMSCS70349 is a silicone O-ring sized to Dash 349 standards, with a 4.5-inch inside diameter, 4.875-inch outside diameter, and a 3/16-inch (0.1875-inch) round cross section. Rated for a wide service temperature range of -80 degrees F to 450 degrees F, this O-ring is suited for static and dynamic sealing applications where dry heat resistance, weather resistance, and ozone resistance are required. The durometer hardness rating is 70 Shore A, placing it in the hard category. It is sold in a pack of five. HVAC technicians, plumbers, and equipment service professionals install these in high-temperature sealing environments across a range of trade and industrial applications.

This O-ring is appropriate for use in systems and assemblies that demand a broad operating temperature range and consistent sealing performance in the presence of weather exposure and ozone. It is noted for good chemical compatibility with oils, solvents, and a range of industrial chemicals, though oil resistance is rated as limited. Typical installation scenarios include sealing flanges, pump housings, valve bodies, and equipment covers in HVAC, plumbing, and general mechanical service where silicone compound is specified.

Key Features

• Wide temperature range: -80 degrees F to 450 degrees F for demanding thermal environments
• Round cross section profile for consistent compression and reliable static seals
• 70 Shore A hardness rated as hard, providing firm resistance under compression load
• Good resistance to weather and ozone degradation
• Compatible with oils, chemicals, and solvents; limited oil resistance noted
• Sold in a pack of five units per order

Compatibility

Designed as an OEM-style replacement or service O-ring for equipment requiring a Dash 349 silicone seal with a 4.5-inch inside diameter and 3/16-inch cross section thickness.

Installation Notes

Installation should be performed by a qualified technician familiar with sealing component replacement procedures. Always shut down and de-energize or depressurize the system before removing or replacing O-rings. Lubricate the O-ring with a compatible silicone-safe lubricant during installation to prevent tearing or distortion of the ring during assembly. Avoid overstretching the O-ring during fitment, as this can compromise the sealing surface and reduce service life.