WARDEN 4 is a multi purpose electronic control system for ensuring ultimate security and economy of plumbing fixtures in prison, police station, and courthouse cells'. Warden 4 uses piezo electric switches to activate low voltage  solenoid valves connected to plumbing fixtures. Warden 4 is used for high security applications allowing control over plumbing fixtures where vandalism, self injury, excessive water use and drug concealment can be major problems. Warden 4 can also be used in Schools, Gymnasiums, Camp grounds, Swimming pool complexes offering water saving features and vandal resistance to showers, basins, toilets, and urinals in fact any plumbing product where control over use is required. Warden 4 is also available in a pre-assembled system for multiple shower installation for mounting in a 94mm wall cavity between 600mm studs.