Gardena bottle cap
thingiverse
A Gardena hose connects to a PET bottle for water rocket projects using a 3D printed coupling based on this design: http://www.thingiverse.com/thing:9596. This idea was inspired by another project at http://www.thingiverse.com/thing:13895. Ensure an airtight seal by printing with 100% infill and add teflon tape to the bottle threads. Improve the Gardena-end's seal with a rubber ring, similar to standard Gardena plugs.
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