If want one like what is on the F-bomb, it is just a matter of Circumfrence.
Figure out the circumference of the oval and the buy the round section of silicone tubing with that same measurement. If you mash the silicone round hose it will make an oval. It might actually be a 3" hose that could fit on a
4" x 2" oval. If not do a metal reducer after the silcone section.
Treadstone aluminum has quite a selection of silcone hose and aluminum tubing.
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