the M210A01 variant should be used instead

this is the direct replacement for the discontinued TRR00579

it provides immediate manual adjustability within a 50°F to 85°F range

allowing for rapid capacity adjustments (from 1/8 to 5 tons depending on refrigerant) without removing the body from the line

As a Permanent Split Capacitor (PSC) design

Resideo CA100A116 Valve Cartridge 320734-701 the M210A01 variant should beThe Resideo CA100A116 Valve Cartridge is a field serviceable replacement component specifically engineered for legacy Honeywell V100 Series thermostatic radiator valves. For technicians servicing "old style" valve bodies in 1 2 inch and 3 4 inch sizes, this plastic TRV replacement cartridge is the essential part for restoring precise flow control and pressure regulation without requiring a full valve body replacement. It replaces the discontinued