This Retrostat Kit has a white cover, and is meant for Honeywell products TP972A1002, TP972A1028, TP972A1036, TP972A1101 that are the heating/cooling type, direct/reverse action. The Retrostat kits convert a Honeywell day/night or heating/cooling pneumatic thermostat to a POWERS Controls direct or reverse acting, two-pipe, dual temperature pneumatic device.