Stainless Steel Pneumatic Push-In Fitting PC4-01 (PC4-M10)

A lot of creators complain that these style PC4-M10 fittings come with wrong sized threads. I don't know. I do know that these things use NPT (pipe) threads - which have a taper. If you design a straight thread part, the taper of the fitting's thread will cause a mismatch. The likely cause of those complaints. Supposedly (I have not tested this) the PC4-M10 fittings use a 1/8"-NPT thread.

It grips as it should. Unlike the stock ones. Even by adding a small cable tie the stock doesn’t hold for long and you end up wasting your tubing. So this is a worthy purchase.

These are great. No C clip needed to hold the bowden tube in. Cheaper then the other leading brand