'69 Fargo W100

Got the engine all together, ran new fuel line, replaced the rusted out water heater with one I had that works (the red canister in line with the heater hoses), upgraded the old pre '70 style vintage regulator with the '70 up style, installed electronic ignition, swapped out the tiny exhaust manifolds with some larger 360 ones, and welded in some exhaust. I used a pair of glass packs I had to try to keep the sound down but I may as well have not used anything at all, I forgot how loud those are. Yesterday I poured a little has down the carb and she fired right up. I advanced the timing a little and it idled beautifully.
Now it just needs some brake work and I need to free up the clutch pedals.


What exactly is the red canister, I have never seen that before.