They are used interchangeably in manufacturer catalogs

This essential mechanical accessory functions as a crank arm for damper linkage applications where the actuator is mounted in front of the damper

which can cause hot spots and premature failure

The R-3710-3007 has a larger

ensure the flow arrow on the canister matches the refrigerant path

Weil McLain 383-500-045 Assembly They are used interchangeably inThe Weil McLain 383 500 045 Ignitor Flame Rod Assembly is a precision engineered ignition electrode kit designed specifically for the Weil McLain Ultra Gas Boiler series. As a critical component in the combustion cycle, this dual purpose electrode facilitates both high voltage spark ignition and continuous flame rectification to ensure safe, efficient burner operation. This OEM kit is compatible with Ultra Series 3, 3UE, and CT gas boilers across all