Mercedes-Benz W123 Monovalve Refurbished Heater Control Valve.
Re-manufactured to original specs. 
Full Replacement 90day warranty. 
Fits all W123 models with w/ACC III - Automatic Climate Control 
1981-1985 280CE w/ACC III, 
1981-1985 300D,300CD, 300TD, w/ACC III, 
Be sure to give your cooling system a through flush before replacing your mono valve. Rust and debris will limit the valve's lifespan and probably contributed the the original unit failure.
We also have Duo Valves for W126 models.
We are based in California and usually ship the following or same day you place your order.
We have a large selection of W116, W123 & W126 parts. Visit our store for other parts you might need or just want. mercedeswerks.com
We're still building our site so the selection is limited, if you need something we don't have in the store yet, call or email us and if we have it we'll add it to the store. We probably have it.
Enjoy your ride.