Yes that was the part number, they didn't have one, said it was discontinued. Luckily I managed to find something which may actually even be the lost part (fits so perfectly, might have just got mixed up.) That information would have been very useful if I'd had it at the time. Thanks for looking it up for me.

Beginning to wonder if the biolife is such a good idea or if I should be thinking of changing it, looks like you gotta spend out on changing filters etc quite often. Anybody know a cheaper alternative that works as well or better?