Been using bicycle inner tube for years. it has a drain hole at the bend.

Oh and Nice work Kevin. Looking forward to see the rig back on the road.
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Craig

My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear
My truck ....... Respect The Rust
If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.