Water cooling jacket for 107mm brushless motor

Water cooling jacket for brushless electric motors with 107mm outer case diameter and at minimum around 150mm case length. (130mm needs to be smooth to accommodate the o-rings)

It has 3 split rings inside that force the water to spread out around the diameter, so you don't end up with water flow just between the openings along one side.

You will need two ¼" BSPP threaded hose couplings, I used ones with an 8mm barbed fitting.

You also need two imperial O-rings in the size 107.54 ID x 3.53mm Thickness.
I bought these: https://www.remlagret.se/products/107-54x3-53-mm-o-ring-nbr-70-svart
A US supplier is: https://www.mcmaster.com/9452K194