Siphon TYPHON made ​​of polypropylene conical section consists of two elements (a funnel and a pan assembled together with stainless steel screws) to be applied within grids and gratings in cast iron and spheroidal in support with the entire surface of the perimeter  an edge port siphon formed in fusion inside the frame of the discharge grilles.
The flow of runoff and rainwater downpipes, exhaust is fed into the grid going to fill the tank and siphon protruding from the outer edge.
The reservoir of the siphon is filled completely so that effectively prevents odors and gaseous formations, formed in the exhaust pipe below the cockpit, they can flow out.