The Johnson Controls T-4002-5017 Dial is a critical replacement component designed for horizontal mounted thermostats within the T-4000 series pneumatic control systems

Constructed from heavy-duty brass

including gas-fired furnaces and electric air handlers

This specific part

Thermal Efficiency: Maintains the correct BTU input for 25

Watts 0881427 Gaskets The Johnson Controls T-4002-5017 DialThe Watts 0881427 (GB C) is a professional grade high temperature gasket kit engineered for 1 inch dielectric unions, specifically the Watts 3001 and 3002 series. For contractors managing hydronic or steam systems, these EPDM gaskets provide a critical barrier against galvanic corrosion when joining dissimilar metals. Designed to handle the rigors of commercial piping, this dielectric union repair kit maintains seal integrity in steam applications up