Astonishing 39

Astonishing in its principle; water coming out of the end ball is transmitted to the rear which has the effect of advancing the whole (of course it grows very slightly). I just use it on the drain pipe stormwater my garage descent. The pipe was clogged with leaves, sand, ... I should have taken over the length (10 or 15 m). This device allows to reactivate an evacuation that is inaccessible without major work.