Honeywell Cover Plate Assembly for use with RedLink VisionPro Thermostats. Use the THP2400A1019 cover plate assembly to cover marks on the wall or to mount the thermostat to a 2 in. x 4 in. electrical box. The THP2400A1019 cover plate assembly contains one cover plate, one bracket, two #6-32 x 5/8 flat head screws and two #6-32 x 1/4 pan head screws.