Vintage Whizzer tank- cap gasket options

[Matt thomas]

I've done a little research, but can't seem to find much info. I made a new gasket out of rubberized cork gasket material, not working so good for me. Is there something more proper you guys recommend? Retailer with a quality gasket, or new cap?

Many thank!
Matt

 

[Matt thomas]

Im still leaking. Haha!

 

[Superman1984]

Try an old rubber bicycle tire maybe; cut in 1/2 & then round as cap. Snug fit so no wide gaps. I have made some make shift gaskets from cardboard cereal boxs, innertubes, packing foam, & Gorilla tape so laugh but each 1 sealed different things in a pinch