Struth. Was on the phone to fowlers as i wanted to replace an o ring that is in the 2stroke oil supply circuit thats perished.
Well its 3mm dia and maybe 15mm across. You cant buy it on its own. It comes as part of THE COMPLETE TANK ASSEMBLY.
Just guessing what that would cost (it was poa and a back order item, quell suprise) gave me sweats.
Pack of various from halfrauds i guess.