cooling system

hi help wanted please , i have a 300 tdi on a L reg,from the expantion tank there is a pipe that runs down in to a plastic funnel shaped (valve) at least i think its a valve which has two pipes coming off one to the rad the outher runs to another part of the engin i would like to know what the plastic funnel shaped thing is called as my one has split in too and im trying to find one . thanks neil.

air purge valve

thanks for your help, do you know where i can get one from. neil

the part is a esr2348 pump ejector try searching for it have found one reference to it Britcar (UK) Ltd > PCH117840 BLEED PIPE ASSY EXPANSION TANK 300TDI(G)

once again thank you for your help, part orderd. atb Neil.