Value Collection ZMSCE70109 Dash 109 Epdm O-ring

Product Description

The VALUE COLLECTION ZMSCE70109 is a Dash 109 EPDM O-ring with a round cross section, designed for static and dynamic sealing applications in fluid and pressure systems. It measures 0.313 inches inside diameter, 0.500 inches outside diameter, and 0.0937 inches thick. The compound is Ethylene Propylene Diene Monomer (EPDM) with a 70 Shore A durometer hardness rating. EPDM is the correct material choice where resistance to hot water, steam, and phosphate ester hydraulic fluids is required. Licensed HVAC technicians, plumbers, and fluid power technicians regularly specify this compound for those service conditions.

This O-ring is suited for residential and commercial plumbing systems, hydronic heating circuits, steam service lines, and hydraulic systems that run phosphate ester-based fluids. It is also noted for excellent resistance to Skydrol fluids used in commercial aircraft hydraulic systems, making it appropriate for aviation ground-support and MRO applications. The -65 degrees F to 300 degrees F working temperature range covers most hot-water and low-pressure steam service scenarios encountered in trade work.

Key Features

• EPDM compound provides strong resistance to hot water, steam, and phosphate ester hydraulic fluids
• Rated for service from -65 degrees F to 300 degrees F
• 70 Shore A durometer hardness for a firm, reliable seal under system pressure
• Round cross section ensures consistent compression and predictable sealing behavior
• Dash 109 standard sizing allows direct drop-in replacement across compatible fittings and housings
• Sold in a package quantity of 100, suitable for shop stock or service fleet restocking

Compatibility

Designed as a standard Dash 109 O-ring replacement compatible with grooves and ports sized for 0.313 inches ID and 0.500 inches OD. Compatible with hot water, steam, and phosphate ester fluid systems per manufacturer specification. Not recommended for petroleum-based oils, fuels, or chlorinated solvents where EPDM is chemically incompatible.

Installation Notes

Power down or isolate the system and relieve all pressure before removing the old O-ring or seating the replacement. Inspect the groove for burrs, corrosion, or damage that could cut or extrude the new seal. Lubricate the O-ring with a compatible fluid or grease rated for EPDM compounds before installation — never use petroleum-based lubricants with EPDM. Plumbers and HVAC technicians should verify local code requirements under IPC or IFGC where O-rings are used in gas or potable water service.