Boarderguy
Chief Narctopus Wrangler
It does not collapse at all. The only trouble is the design of the hose. It's a spiral fused hose that is strong against crush/collapse, but can delaminate or split where it's fused together. Mine did this and I couldn't find the leak into it fully ruptured.OK. I'm not convinced that sort of hose is really the right hose for the job. It's not going to collapse or kink easily - but its not a great option for fitting hose barbs etc into either.
Besides Light Monkey who else makes Pee valves? I might take a look at what hoses other Pee valve manufacturers are supplying with their kits.