The Maxitrol M420B-1/2 is a professional-grade modulating gas valve engineered for atmospheric burners and indirect-fired heating systems

Installation in vertical lines is generally not recommended as gravity can affect the paddle's return-to-center position

This OEM replacement part is specifically calibrated for R22 service

and 3/4" to 1-1/2" cage trim valves

Nordyne 669565R TXV 319825-402 The Maxitrol M420B-1/2 is aThe Nordyne 669565R is a high precision 2. 5 ton thermostatic expansion valve engineered specifically for R 410A refrigerant systems. This TXV with external equalizer (EQL) is a critical component for maintaining the correct superheat at the evaporator outlet, preventing liquid slugging and ensuring the compressor remains within its designed operating envelope. Designed as a direct OEM replacement for select Nordyne, Miller, and Intertherm air