this entire post seems to be talking about something else
there is is no “flapper” and the original hose in question is 78mm (about 3") in diameter and 12" long.
a black fabric rubberized hose with a spiral wire support.
Same feeling here. Looks like a frantic AI spammer bot attack with trans-forum copy&paste weaponry.
German engineers ? What a miss. Learn!, AI.
Regarding the spiral hose - as I’m still ahead of the subject, and mine is somewhat useable - I guess I would lean towards heating & ventillation stores / suppliers.
Or maybe some truck interior vent supplies / manufacturer ?
Either way - I have a feeling that double-wall pipe could be welcome here …
AFAIK Mk2 & Mk1 3.4 had similar intake flex pipes for engine-mounted intake silencer.
But Mk1 2.4 with downdraft carburetors had different intake setup. Which one we’re after ?
My Mk1 3.4 had this thing under the hood:
I see that same dimension pipe is also going down to wet intake air filter under the wing.
It’s made of extruded aluminum double-clad in some paper or similar.
Perhaps same pipe was used under bonnet and got deteriorated fast
living just above the exhaust manifold.
My XK120 FHC uses something similar to Piotr’s picture. I don’t know if its the same size.
McMaster-Carr has duct hose in a wide variety of types and sizes.
but, I’m only interested in original or what looks original.
as in the picture I posted. under the wing is a different hose that was never in the engine bay. the original is a rubber hose with a spiral wire and a texture a bit like a stockinette radiator hose.
funny that the only hose in the world that falls into this category is made for a Lamborghini