Originally Posted by Chi_San
The AIR pump pumps air from the air intake into the exhaust to help heat up the primary catalyst. There should be a one way valve to prevent exhaust from going backwards into your intake. If that failed, or is leaking, you could have exhaust going up to the pump and possibly melted that hose. That's pure speculation, as I have no idea where exactly that is from that pic, and I don't have an AIR equipped car.
Awesome, that was one of my theories. Are these the same valves notorious for sticking due to water corrosion? Seems like the delete would be most efficient in eliminating any possible future problems. Doesn't make sense to replace the unit if the valve could possibly get stuck/fail again