Hi just to let you know it is definatly a drier/ filter for the air con, when i brought my leon the air con wouldnt get cool at all had it re gassed but to no effect, chap then sugested this part and picked me one up for £45 pricey for a metal filter but worth it to get the air con working again. if i remember rightly there is a bolted hose to the top and bottom ends with little o rings on. if you do change this dont re use the o rings as they have a tendancy to leak. hope this is helpfull to everyone/anyone