There is no technical difference in form

Designed for high-performance HVACR hydronic systems

the solenoid coil assembly is serviceable independently

and carbon to prevent expansion valve plugging

Resideo VR8304M3103/B Gas Valve R-448A There is no technical differenceThe Resideo VR8304M3103 B Gas Valve is a heavy duty, 24V intermittent pilot gas valve designed for single stage heating systems. This dual automatic valve combines a manual valve, two automatic operators, and a built in pressure regulator into a single compact housing. Rated for a 3. 5" WC (water column) output, it features standard 1 2" NPT inlet and 3 4" NPT outlet connections, making it a drop in HVAC replacement part for high capacity boilers and