A lock to hold water is made up of: a body, with a first cavity and a second cavity inside it. There is an arch with a first and second end. The arch is place in the first position where the first end is inserted in the first cavity and in the second position where the first end is found outside the first cavity. A spring is on this arch and is stretched across to the second position and works against the force that tends to bring the arch into the first position. A third cavity that holds a switch, that has an ogival end and a flat end. There is also a notch in the arch for the ogival end to be maintained in the first position and to move it into the second position. Lastly there is a stop bolt for the movement of the arch.
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