Replacement O-rings
They seem to do the trick I'm so glad you offer replacement parts thank you.
OEM Viton o-rings for Fumo Pipes
Replace your lost or damaged Fumo O-ring in your Fumo carb or body with these direct replacements.
Carb o-rings (.5in diameter) keep the carburetor air tight.
Body o-rings (.75in diameter) hold the extension tube on tight.
These Fumo O-rings are as pro as everything else Fumo Pipe; Viton aircraft grade O-Ring. Viton O-rings have an extremely wide temperature range, low compression set low gas permeability, excellent resistance to acids, mineral and vegetable oil, aromatic hydrocarbons and several organic solvents and chemicals (hopefully none of those get in your Fumo). Viton O-rings are also exceptionally resistant to aging.
Made in the USA