who makes a gas cap that doesnt leak?

[brownz]

I have a 1970 nnova that i cant find a gas cap that diesnt leak. does anyone know of a good quality cap that i could get?

[chr2002ca]

I actually had some trouble finding a non-leaking gas cap also for my 69 stainless OER tank. I finally tried adding a second rubber ring(pulled from another cap) on the cap to double them up and that made the gas cap fit very tight and it no longer leaks.