It is a device that, in case of obstruction of the grid of the manhole, allows it to open up, automatically, to allow water into the sewer system. The invention is designed to underpasses, garages, cellars, basements, etc. ... As soon as the water flows, the grid automatically closes.
My name is Antonio Gelfusa, I was born in Pontecorvo (ITALY) the 01/01/1950 and that is where I've been living. I worked in the boiler room of the State Monopoly. In my youth I was seven years Sailor, embarked on a destroyer. Today, being retired, I delight in my workshop to build things that I think and I hope will be useful for me and for the community.
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