Siemens 192-478 WALL BOX ROUGH-IN, 2-PIPE, ACCESSORY & SERVICE KIT, PROD GROUPS 186, 19X, 832Siemens 192 478 Wall Box Rough In, 2 Pipe, Accessory Service Kit, Prod Groups 186, 19X, 832 This is a Wall Box Rough in Accessory and Service Kit Used with Product Groups 186,19X, 832, Room and Duct Hygrostats, Powerstar, D Series, For 2 Pipe Dual 1 8" OD Copper with plaster plate, thermostat chassis plug in adapters for easy maintenance