Value Collection ZMSCS70355 Silicone O-ring Dash 355

Product Description

The VALUE COLLECTION ZMSCS70355 is a Dash 355 silicone O-ring with a round cross section, rated at 70 Shore A hardness. It measures 5.25 inches inside diameter, 5.625 inches outside diameter, and 0.1875 inches thick. Silicone compound provides a wide service temperature range from -80 degrees F to 450 degrees F, along with good resistance to weathering and ozone. Licensed HVAC technicians, plumbers, and mechanical contractors install this O-ring as a static or low-motion seal in fluid and gas systems where dry heat resistance and temperature cycling are primary concerns.

This O-ring is suited for residential and light commercial sealing applications involving oils, chemicals, and solvents at moderate concentrations. Typical uses include pump housings, pipe flanges, valve bodies, and equipment access covers where a large-diameter face seal or bore seal is required. The silicone material performs well in HVAC equipment, water treatment assemblies, and general mechanical systems exposed to elevated ambient temperatures or outdoor weathering conditions. Sold in a package of 5 units.

Key Features

• Silicone compound rated from -80 degrees F to 450 degrees F continuous service
• 70 Shore A hardness for a firm, reliable seal under compression
• Round cross section for standard O-ring groove seating
• Compatible with oils, chemicals, and solvents at general service concentrations
• Good weather and ozone resistance for outdoor or exposed installations
• Packaged in quantities of 5 for bench stock and service van inventory

Compatibility

Designed as an OEM-style replacement or service seal for any application requiring a Dash 355 cross-section O-ring in silicone material at 70 durometer hardness.

Installation Notes

Power down or de-energize equipment and relieve all system pressure before replacing O-rings. Clean the groove and mating surfaces thoroughly before seating the new ring to prevent pinching or extrusion. Lubricate with a compatible silicone-based lubricant only, as petroleum-based greases can degrade silicone compounds over time. Note that this compound carries limited oil resistance and is not FDA approved, so verify suitability for food-grade or potable-water applications before installation.