'Bonomini" eccentric coupling for WC is the key element to connect the outlet of WC bowl.This eccentric coupling is made from PP(polypropilen) for a good resistance to chemical attack and excellent insulating properties.The length of the coupling is 12 cm with an outlet of 110 mm and 40 mm eccentric.''Bonomini" eccentric coupling for WC can be quickly connect and has an easy installation system