Legris 3116 08 00 Nylon Push-to-Connect Fitting, Inline Bulkhead Union, 5/16" or 8 mm Tube OD

works like a fitting

Works, no leaks (liquid coolant). Exactly what I needed.

Works great. Haven't had any problems with the connection this fitting repaired.

Perfect for my application using a 4mm plastic tube. Prompt delivery

Easy to use.