Watertight Door Alarm System
- MSA-1ZQ Watertight Door Alarm Unit
- MSA-1FQ Flush Type Watertight Door Repeater
- MSA-1FG Wall Type Watertight Door Repeater
- MSA-1DG Power Supply (Collection Box)
- MSA-1J Proximity Switch For Watertight Door Alarm System
- MSA-1H Conversion Box For Watertight Door Alarm System
- MSA-1L Indicator Light For Watertight Door Alarm System
- BBJ-1 Explosion-proof status indicator light