This is the rubber elbow for the metal pipe that runs from the left side air-filter to the idle circuit. This is for T2 baywindow Kombis fitted with the original twin Solex 32/34 PDSIT carburettors with the stock air-filter assemblies. These were only fitted to Type 4 1700 to 2L engine
If either of these elbows are broken or cracked your idle circuit will draw in unfiltered air and potentially cause damage to both your engine and carburettor.
Two required per engine. Sold individually.