hose pinchers are any device which is used to stop the flow of liquids,
or gas through a hose. There are many different types of hose
pinch, however pictured here is a screw-type set of hose pinchers.
These work by screwing the wing nut to clamp the hose in the jaws
of the tool.
Hose pinchers are a very effective and cheap way of closing a pipe
temporarily during maintenance work on a related part. For example
when changing a fuel filter the pipe either side can be shut off
using hose pinchers.