Switch, pushbutton, single, 120 VAC 15 amps, 120 VDC 1 amp, watertight, non-magnetic. The switch has normally open (NO) and normally closed (NC) contacts. Normally wired single pole, normally open and connected to a Type 9TB2 terminal board for connection to external wiring. Enclosure dimension is nominally 2-1/2" round. Symbol 789 per NavShips Drawing 815-1853053 Rev D. Switches per Revision "D" will be supplied unless otherwise specified. Revision "C" is still used for the DDG51 Class. NSN 5930-00-687-1096.