This retaining clip works with the 8mm OD DuoTight fittings.
This is a push-in fitting.
I printed this at 0.15mm quality with variable layer height.
Version 2 is a bit thinner making it easier to install.
Version 1 is only for ASA and ABS.
I do Not recommend PETG for this model.
The author marked this model as their own original creation.