Just a couple quick adapters for the servicerite kit you get off amazon, nothing fancy but it gets the job done. there is a range of sizes from small to big, so it should fit most systems. for my toyota matrix it was the small that fit just right.
Small = 6mm to 15mm (Approx [¼" to 5/8"])
Medium = 8mm to 20mm (Approx [5/16" to 13/16"])
Large = 10mm to 25mm (Approx [3/8" to 1"])
Print out of TPU if you can with at least 2 walls and whatever infill you'd like, you could print out of hard plastic but you'd have to glue the piece to the existing nipple. The internal hole size is 5.5mm (7/32") to fit the existing barb that comes with the kit.
The author marked this model as their own original creation.