Chat about your 9n Polo (inc GT and Fun)
2 posts • Page 1 of 1
- Site Admin
- Posts: 14458
- Joined: Sat Nov 11, 2006 5:29 pm
- Drives: 91 Golf GTI, 01 TT 225, 67 Q7
- Location: Poole, Dorset, UK.
Its a one way valve to allow air in but not oil vapour out. Without it, youll get backflow and oil will come out.