Screw on tire and tube deflator, screws on the external threads of standard valve stems. Valve core must be removed to use. Uses compressed air and the venturi principle to suck tubes completely flat for patching and to ease installation. Can also be used to suck tires flat and draw the tire beads inwards to ease starting bead breaking wedges such as on large tractor tires. Use of a clip on air chuck is recommended.
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Screw on tire and tube deflator or aspirator for deflating tubes and tires flat.