The siphons were the lead pipes that carried water through the interior of the structure, and while the siphons are not as aesthetically pleasing as the large arches because they are hidden inside the interior of the aqueduct, still constituted an important part of the engineer's work within the architecture. As Peter Aicher states in The Guide to the Aqueducts of Ancient Rome, “the term siphon was given to the sections of the aqueduct where the water entered pipes which carried the water down one side of a valley and up the other side. at an altitude nearly the same as its starting point." The arches facilitated the movement of water by gravity, but the siphons were the tubes that carried the water within the walls of the arches. It is evident that the Romans were careful in the way they made the pipes used to transfer H2O from the source into the cities. As written by A.Trevor Hodge in Siphons in Roman Aqueducts, “Roman lead pipes, which, in theory round, tended to take on an oval shape. by the way it was formed (by bending a flat lead plate around a wooden support) core and joining the two edges) and by the thick solder that runs along the top