This is for an old tanker truck. The old system for telling how much water is in the tank was a semi-clear hose that ran the height of the tank. But due to the clarity of the water, which is commonly sucked out of mud holes, that tube has discolored and no longer see through, not cleanable and not replaceable (long discontinued).
The truck can pull a vacuum inside the tank to suck up water, and also pressurize the tank to discharge it, the hose must be able to withstand substantial vacuum without collapsing (able to ‘suck’ water UP 25+ feet, whatever that works out to ), and 300+ PSI pressure.
Because this truck is a pressure vessel on wheels I am looking for a solution that does not involve actually penetrating the tank with wires or other openings. I am looking for a simple, reliable, foolproof and foul-proof method of monitoring the water level.