Pipe Inlet Rubber Cap Thingy?

[vinnyb]

[quote author=vinnyb link=topic=26199.msg315618#msg315618 date=1590836580]

https://www.ebay.co.uk/itm/Motorcycle-Va...SwL9Bd-Pmc
Do you mean one of these?
I wouldn't have thought it would run particularly well with one missing, it'll let excess air into the system.

Yes there them, thank you, I used to have the scottoiler connected to one, do they not blow air?

[/quote]
No they suck, the scottoiler works on a vacuum, they're there to attach carb balancing vacuum gauge pipes to.