You can insert 1/8" pipe or tube connector to any plastic box etc.
It can hold water flow and low-pressure air, perfect for hydroponics and water systems in garden. USE COMMON SENSE WITH LEVEL OF THE PRESSURE!!
Recommended sheet thickness: 0,8..3mm (depends your 1/8" plugin thread lengths)
It needs 14mm trough hole
O-ring from size OD18..20mm (on multisize) and 2,4mm thick
1/8" Pipe/tube connector, It locks those parts together like bolt!
Remember flip those parts to flat on printbed before print! No need supports! :)