Spare part for Counter Pressure Bottle Fillers.
Stainless Steel ball valve with three positions: open - closed - open.
Each of the female 1/4" FPT connections can be opened towards the male 1/4" MPT connection. With the handle in the middle position the valve is closed.
Use teflon tape for all threaded parts.
After some usage the ball valve may require some tightening. This is easily done by using a hex key on the socket head inside one of the horizontal connections of the valve. The nut under the handle may also be tightened with a fixed ratchet.