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Title: What happens when gas thieves get master keys?
Review: Fair question. The answer is, if they can't get into your tank the 'normal' way, they just punch a hole in your tank with a screwdriver, or cut the rubber hose part of your filler tube. Think locking caps are expensive? - Try pricing a new tank or filler system! IMHO, all the locking caps do is serve to keep 'honest' people 'honest'.
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