Value Collection ZMSCE70427 Epdm O-ring Dash 427 9 Pack

Product Description

The VALUE COLLECTION ZMSCE70427 is a Dash 427 EPDM O-ring with a round cross section, sized at 4.75 inches inside diameter, 5.25 inches outside diameter, and 0.25 inches thick. Made from Ethylene Propylene Diene Monomer (EPDM) compound with a 70 durometer hardness rating, this O-ring is built for sealing applications that involve hot water, steam, and phosphate ester hydraulic fluids. It ships in a package of 9 rings. Licensed plumbers, HVAC technicians, and hydraulic system mechanics install this type of seal in fluid handling and pressure systems requiring reliable static or low-motion dynamic sealing.

This O-ring suits applications in plumbing, HVAC hydronic systems, and industrial fluid circuits where EPDM compatibility is required. EPDM material performs across a wide temperature range, from -65 degrees F to 300 degrees F, making it appropriate for both hot-water heating systems and steam service. It is also noted for resistance to Skydrol fluids used in commercial aircraft hydraulic systems and is recommended for phosphate ester type hydraulic fluids. This ring is not suited for petroleum-based oils or fuels despite a listed compatible material notation in the spec data.

Key Features

• EPDM compound with 70 durometer hardness for firm, reliable sealing
• Wide temperature range: -65 degrees F minimum to 300 degrees F maximum working temperature
• Resistant to Skydrol hydraulic fluids used in commercial aircraft applications
• Suitable for hot water, steam, and phosphate ester hydraulic fluid service
• Round cross section, Dash 427 standard sizing for drop-in replacement use
• Sold in a package of 9 rings per order quantity

Compatibility

Designed as a Dash 427 standard O-ring replacement for systems requiring EPDM seals in hot water, steam, hydronic heating, and phosphate ester hydraulic fluid service. Verify groove dimensions against the 4.75-inch ID and 0.25-inch cross section before installation.

Installation Notes

Shut off fluid supply and depressurize the system before removing the existing seal. Clean the groove surface of any debris or residue from the previous ring before seating the new O-ring. Do not use petroleum-based lubricants with EPDM seals; use a compatible water-based or silicone-based lubricant if needed for installation. Follow applicable codes such as ASME B31 or IFGC for pressure and gas systems when replacing seals in those circuits.