Hello Tuomas S.,
All of our pre-bent tubes are none chamfered. The brass tube also is compatible with other brands' 14mm OD hardline fitting too. But since around the cutting of brass tube, OD maybe not 14MM, maybe smaller. And then you can use our EML series fitting, which includes an extra Oring for brass tubing. We will revise the information in the brass tube description too. Thank you for your suggestion.