"Used to pump sludgy water from submersible pump. Perfect for the job. Bright colour means you don't trip over it in the dark. Tough, durable; will see me out. Rolls up flat for convenient storage. Will stop water flow if put round too tight a corner (common sense)."
"Easy to store, but really doesn't like going around corners - difficult when it's attached to a dirty water pump at the bottom of a drain! I will probably look for a shorted piece of large diameter "normal" hose to connect between this and the pump"