Johnson Controls T-4000-610 Conversion Kit From T-400 Series 1-Pipe

The Johnson Controls T-4000-610 Conversion Kit was a cost-effective solution to replace old and inefficient pneumatic controls in your one pipe HVAC system. It acted in effect as a bridge allowing you to interface the T-400 Series thermostats with the newer and possibly more effective T-4000 Series devices from Johnson Controls or other producers. It is suggested to upgrade your T-400 Series thermostat to single temperature in a one-pipe HVAC system, the parts needed to do so. This strong plate can fix the new T-4000 Series unit in the old housing of your thermostat where previously, it was not possible. This part probably linked the current piping system to the new thermostat to make sure there was a perfect interface.