Schrader & presta valve cap duck
thingiverse
Based on Willie rubber ducky https://www.thingiverse.com/thing:139894. Added a schrader valve (and compatible with a presta adapter), and a hole for a necklace mount. V10: Added a longitudinal hole, allowing breathing if ingested. Part of my valve cap collection: https://www.thingiverse.com/xxmtx/collections/38672306/things Tolerance are pretty tight, you need to form the thread, first time you screw it to the valve. Presta adapter is avaiable here: https://www.thingiverse.com/thing:6077663
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