This is the same Fill and Vent Set used on the PNP range of jets. It is a total solution - see image for included parts.
The fill valve is a one-way valve that uses a 1/4 tun adaptor to fill and a dust cap for cleanliness and extra security. The Vent fitting includes an adpator for your overflow tank and a bung with a RBF flag included. THe Vent Bung is also fitted with a magnet so you have less chance of losing it!
Neat and reliable system that simplifies fuel filling.
Vent Bung with RBF Flag