This water valve is controlled by a parallax 180 degree servo.
Printed on Blue Painters tap affixed to heated bed.
The cylinder fits very tightly to prevent leaking. To fit the pieces together, you will need to use 400 grit sand paper and about ten turns on the valve itself and a few turns inside the valve body. I made a loop of the sand paper and put the valve in side the loop and turned in my hands about 10 turns. The valve should fit snug into the body and you should be able to turn it in the socket by hand with a little force. I used ABS and Acetone slurry to glue the valve cover to the body and the gear to the valve itself. Turning the valve when all assembled should take a little force and shouldn't require any tools.