The Lennox 72L34 and 72L3401 are technically identical parts with the same specifications and fitment

Always verify the unit's rating plate for the correct drill size

but the technical specifications and fitment are exactly the same

Key Benefits for Technicians Specifically sized for 8-inch 4R actuators to ensure a precise

The additional speed tap provides more flexibility for system balancing but can be capped if not required

Maxitrol M520-3/4 Gas Valve Refrigerant The Lennox 72L34 and 72L3401The Maxitrol M520 3 4 Gas Valve is a 3 4 inch NPT modulating gas valve engineered specifically for atmospheric, indirect fired burners used in commercial and industrial space heating. As a core component of the Selectra electronic gas flame modulation system, this valve provides instantaneous, non fluctuating temperature control without the need for external mechanical activation, motors, or butterfly valves. The M520 3 4 modulator valve is