Quoted from KenLayton:The main advantage of the tube is that it is very useful for long skinny stuff like legs, habitrail ramps, lockdown bars, lockdown bar receivers (if you've got at least a 4" diameter tube to do it in).
I didn't have any tubes like that to soak in, so instead I went down to the hardware store and picked up 10ft of plastic eavestrough and a couple of ends for around 10 bucks. Cut a length of it to match the legs, sealed the ends up with some silicone and it made the perfect soaking vessel.