http://cgi.ebay.co.uk/VW-GOLF-BORA-MK4-1-8T-20VT-SILICONE-BREATHER-PIPES-AGU-/150440204138?cmd=ViewItem&pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2306ef576a#ht_1859wt_1165 as titled... what is?