Value Collection ZMSCS70338 Silicone O-ring Dash 338 5-pack

Product Description

The VALUE COLLECTION ZMSCS70338 is a silicone O-ring with a round cross section, sized to the Dash 338 standard. It measures 3.125 inches inside diameter, 3.5 inches outside diameter, and 0.1875 inches thick. Rated at 70 Shore A hardness, this O-ring is engineered for sealing applications that demand a wide operating temperature range, from -80 degrees F to 450 degrees F. The white silicone compound provides good dry heat resistance and strong weather and ozone resistance. Each package contains 5 pieces. Licensed plumbers, pipefitters, HVAC technicians, and industrial maintenance professionals install this type of O-ring in fluid and gas sealing assemblies.

This O-ring is suited for applications involving oils, chemicals, and solvents where silicone compound compatibility is appropriate. It is commonly used in HVAC equipment, plumbing fittings, pump housings, and general industrial sealing points that see extreme temperature swings or outdoor exposure. The wide temperature tolerance makes it a practical choice for both high-heat and cold-environment installations. Note that oil resistance is limited with this silicone compound, so verify fluid compatibility before installation in heavy oil service.

Key Features

• Dash 338 standard sizing: 3.125 inches ID, 3.5 inches OD, 0.1875 inches thick
• Silicone compound rated for -80 degrees F to 450 degrees F operating range
• 70 Shore A hardness for firm, reliable sealing under compression
• Round cross section for consistent groove fit and even load distribution
• Good weather and ozone resistance for outdoor or exposed installations
• Compatible with oils, chemicals, and solvents within silicone service limits

Compatibility

Designed as a standard Dash 338 O-ring replacement suitable for any groove or fitting that accepts a 3.125 inches ID by 3.5 inches OD by 0.1875 inches cross-section silicone O-ring.

Installation Notes

Installation should be performed by a qualified plumber, pipefitter, or HVAC technician following applicable codes such as the IPC or IFGC. Always depressurize and de-energize the system before replacing O-rings, and confirm that the groove dimensions match the Dash 338 profile before seating the ring. Avoid twisting the O-ring during installation; light lubrication with a compatible lubricant helps prevent tearing and ensures even seating. Verify chemical and fluid compatibility with silicone compound before use in oil-heavy service environments.