GAI-Tronics RigCom The GAI-Tronics Rig Com Stations are made for a common-talk, or master/slave interaction program for the following detrimental locations: Rig com 400-001: Category I, Div.I, Categories C and D; when set up according to GAI-Tronics Pub. 42004-381, Management Pulling #73214. The program provides push-to-talk, release to-listen operation, and has a regional on/off amount control move to move on and controls the amount stage for each station separately. The Rig-com 400-001 contains a linked speaker and car owner device. The 400-002NS does not involve the speaker and car owner device, but does have a 1/2-inch NPT gap to station install and be connected the speaker car owner device to the station.