I know exactly the pipe pieces you reference and in my virgin ownership period ( ie before i realised the bloody car could bankrupt me if I went to RR dealer for supplies) paid £14.00 for a 3"-4" length of pipe from local RR dealer. When it went again 'cos they seem to perish easily I put a piece of pipe from my aquarium air pump on as a stop gap.........that was 14 months ago and CC still works fine!!!!!!!!!!!!! In reality if you ain't got an aquarium piece of fuel line/breather hose of same diameter works fine and if you have good local independant motor factor or radiator specialist they will give you a piece of a scrap cut off for bugger all or pennies........£14.00 my arse. but I fell for4 it only once. cheers