Sovol SH02 coupler with PC04-M10 pneumatic fitting

EDIT/UPDATE: one PETG coupler broke after couple of months so I decided to print one in TPU and it works even better (I will update if TPU will not be able to handle the heat). So recommended filament for this project is TPU. I printed with tree supports but only on small threads(see picture).

“ORIGINAL POST” 
Reuses original gasket and nut.
Left some extra space inside so the bend wouldn't be very hard.
Tested with brand new spool as well, all good.
Printed with PETG
0.2 layers
no supports
4 top/bottom layers
I pushed the PTFE tube inside, enough so original gasket can close the hole. I push one out when I'm using a spool.