https://www.amazon.com/Authentic-Capricorn-Filament-Upgraded-Pneumatic/dp/B07PS3NH82/ref=sr_1_5?crid=2B59LI98AOOA4&keywords=ptfe+tube+for+1.75mm+filament&qid=1579464253&sprefix=ptfe%2Caps%2C161&sr=8-5 Is this the kit you're talking about?

Authentic Capricorn PTFE Bowden Tubing 1 Meter XS Series for 1.75mm Filament with PTFE Teflon Tube Cutter and Upgraded PC4-M6 and PC4-M10 Pneumatic Fittings with Metal Teeth and 2 Blue Collet Clips

This is what I purchased for the bowden.

I installed Capricorn on my Aquila about 2 months ago and I'm only sorry I didn't do it sooner. I think my prints have improved but the PETG prints have improved drastically. This is what I used

https://www.amazon.com/gp/product/B07PS3NH82/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

There is enough tubing to do the Aquila Bowden at least twice and the fittings are high quality. The tubing is approved by Creality and has a high temperature resistance. Whether you get what I got or another Capricorn ,,, it's worth every penny.

PS the cutter is great