Value Collection ZMSCS70346 Silicone O-ring Dash 346

Product Description

The VALUE COLLECTION ZMSCS70346 is a round cross-section silicone O-ring engineered for static and dynamic sealing applications across HVAC, plumbing, and industrial systems. It measures 4.125 inches inside diameter, 4.5 inches outside diameter, and 0.1875 inches thick, corresponding to Dash 346 sizing. The silicone compound carries a Shore hardness of 70 and is rated for service from -80 degrees F to 450 degrees F, making it a reliable choice where wide temperature swing and dry heat resistance are primary design requirements. Each package contains 5 rings. Plumbers, HVAC technicians, and mechanical contractors install this type of seal in flanged fittings, pump housings, valve bodies, and equipment access covers.

This O-ring is suited for residential and commercial installations where silicone's resistance to weathering, ozone, and elevated temperatures is needed. Its Dash 346 designation follows standard AS568 sizing, allowing direct dimensional cross-reference when replacing worn or damaged seals in existing assemblies. The white silicone construction offers limited oil resistance and is described as compatible with oils, chemicals, and solvents in moderate-exposure applications. It is not FDA approved and should not be specified in food-contact service lines where FDA-grade material is required.

Key Features

• Dash 346 standard sizing: 4.125 inches ID, 4.5 inches OD, 0.1875 inches thick
• Silicone compound rated from -80 degrees F to 450 degrees F for wide thermal range service
• Shore hardness 70 for firm, reliable sealing under compression
• Good weather and ozone resistance extends service life in exposed or outdoor installations
• Compatible with oils, chemicals, and solvents in moderate-exposure environments
• Sold in a pack of 5 to support maintenance stock and repeat service calls

Compatibility

Designed as a standard Dash 346 AS568-profile O-ring replacement for any flanged, threaded, or gland-seal assembly specifying a 4.125-inch ID silicone ring at 0.1875-inch cross-section thickness.

Installation Notes

Plumbers and HVAC technicians should de-pressurize and drain or isolate the system before removing the existing O-ring. Clean the gland groove of debris, corrosion, and old sealant residue before seating the new ring. Avoid stretching the O-ring beyond its elastic limit during installation; lubricate with a silicone-compatible lubricant only, as petroleum-based greases can degrade silicone compounds over time. Follow applicable IPC or equipment manufacturer torque and assembly specifications when reassembling flanged connections.