servo valve for 1/4" wells plastic valve

This is a servo controlled valve I made for an aquarium water exchanger project based on the one I saw from mikedeklerk. I needed it to be plastic as not to kill my fish. I also left a little ~2 mm gap inbetween the valve boxes to allow for easier fitting. So far it seems the S3003 servo I used has enouph power to turn the valve. I wasn't sure if it work at first without a stronger servo since they seem a bit harder to turn.

Unfortunally I think they changed the valve design at some point. I