Summary

Simple cap for "S" type airlock (Geek.com), the ones that come with this type never fit correctly.

In case your curious: This is a Ginger Mead

1 Gallon Wide mouth jar with airlock
2 cups unfiltered honey
3 tablespoons grated ginger
20 Raisins
5 Allspice
5 Juniper berries
1 pack Lalvin EC1118 Yeast
Fill to shoulder with collected rain water

See also a different design for a different Airlock:

https://www.thingiverse.com/thing:34209