Well not literally but they were extremely effective in pinching my fuel line while I was fixing the carburetor on an old gas powered lawnmower. Definitely a lot easier than disconnecting and draining the tank. The hose dangled freely, not a drop came out. I'm sure your mileage may vary, but as for me, I'm very glad I bought these and put them in my tool box permanently. You can buy with confidence. They work well and do exactly what they are advertised to do. They are also very strong – super strong. A good addition to your tool collection when performing maintenance jobs that require a hose clamp.
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