A solenoid is an electrically controlled water valve.
In the rest position, the valve is closed but will open with a 12 V or 24 V power signal. You can install the solenoid in your boat’s normal water system in order to flush the window from debris or salt with fresh water.
This is an alternative to a separate tank for the wiper system. The valve has a G1/4 thread and will fit with standard components using the same thread. Working pressure 0-120 PSI (0-8 Bar).