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I bought the Fumoto, was concerned about it hanging down, but heck it is still quite a bit higher than the front axle! If your in a peril of breaking this valve off your doing something wrong!
You're going to notice if 4 gallons of oil has been released from your truck. The splatter alone from it hitting the pavement will spray well beyond the width of your truck. A friend of mine had the same concern and went with some safety wire on the valve handle. No problems so far.
If wouldn't take someone but a few seconds longer with a wrench to do the same thing.
I would have to say that if someone wants to disable your truck, they will. All they need would be a pair of cheap pliers. Anyhow, if you put on the hose clamp like the site says, they would have to use the same tools to get that off as they would need to unscrew a normal plug.
"You can simply roll under the truck and pop the Fumoto valve open and you're stranded, or worse yet, you don't notice it and burn up you PSD!"
If someone did trip the valve and you didn't notive the 13 quarts of oil running out from under the truck and started it I don't think that it would "burn up" It would crank, empty the remaining 2 quarts in the HPOP and the injectors would stop, engine would stop. You would be as you say "stranded". I like mine, I put a hose clamp on the valve as a back up, takes a pair of pliers to get the clamp off. Recently a poster did something similar, forgot to put the drain plug in lost all the oil and started it up, ran a few seconds and shut down. HPOP empty stops everything.