SUP pump adapter for small bayonet

I currently have an Indiana inflatable foilboard with a double action pump. My wing is from Duotone and it also has a pump - I would rather not drag two bulky pumps around and so I designed this adapter which allows me to use the board pump for my Duotone wing as well. 
I can't find much about the standardised sizing of these fittings but maybe someone else finds this helpful.

Prints fine using PLA and 0.2mm layers. In case anyone wants to tweak the model I am also happy to share the STEP file or onshape link if requested.