What diameter leak off pipe do i need?

Got a p38 dt and doing a plug change and leak off pipe change at the same time, whats the diameter of the pipe so i can just buy a reel? or is there somewhere online that does them?

You should find most local car spares shops/ motor factors keep this in stock as a pre-pack, about 1 metre length labeled diesel leak-off pipe, it just puhes on to the nipples on the top of the injectors and is easily cut to length with a Stanley knife or sharp tinsnips, its usually about £2 a pack, I can't remember the exact size, but I THINK IT IS ABOUT 2.5 MM bore, JV ROVERMAN .

Apparently it is 3.2mm diameter you need, but Halfords sell 3 mm that seems to fit OK,
JV ROVERMAN.