This model attaches to a Kirks soft drink bottle (Aussie brand) which is about 89mm in diameter. The bottle can be dry fit.
The trigger is a paperclip bent so that a string can be attached to it, through the hoop and up, out of the tank.
The parts have been separated so that they can be printed in optimal orientation.
Print @ 100% infill so it does not float.
Glue the flange to the doorframe.
The author marked this model as their own original creation.