The Johnson Automatic Float Switch enables fully automatic operation of your bilge pump, ensuring your bilge stays dry without manual intervention. Designed with a time-proven, mercury-free micro switch, the AS888 activates your pump when water levels rise and deactivates it once the bilge is drained. A rolling steel ball inside the switch shifts with water movement, triggering the micro switch to power the pump precisely when needed. Simple to install and highly reliable, the AS888 is the perfect companion for your Johnson bilge pump, delivering dependable, hands-free performance for peace of mind on the water.