They are expensive Bob. Which is why I was lucky to get some for nothing when Armours got rid of their accessories stock. The Dowty washers are similar at only 25p each. Ron
Thanks for the help Ron.
Unfortunately Amazon UK won't dispatch them to Oz for some reason & all I can find locally is still pricey. I may have to reflect that what's on the bike at the moment works...
I use PTFE tape and Loctite flange sealant under the washer. I leave it overnight before putting petrol in the tank to allow the flange sealant to do its thing......Works well..I use the same method on the crank case breather thread, the engine oil unions into the crank case and flange sealant only on the oil tell tale blanking plug into the crank case....Ian