If you have an old inflatable mattress, consisting of several independent sections, it is easy to adapt as life jacket for boating. You will have to sacrifice one of the middle sections, making it T-shaped hole for threading of the head. To fix the other slightly inflated section around the torso using the waist belt and extra lacing.
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Quickly and securely "to drown out" the water pipe or radiator hose when testing it for leaks by using a simple device. By rotating the handle the rubber grommet sandwiched between two...
