If your injectors are leaking fuel internally the fuel will go into that pipe through the head and then return to your tank. That pipe is very brittle/easy to break and will leak the fuel into the top of your engine if the pipe or washers are not sealing 100%.
Pretty sure toyota would be the only place you could get them.
seeing this is a diesel thread i thought it fitting to add this,bad quility and not toyota but still awsome
http://www.youtube.com/watch?v=QLB2bxYfJEg&NR=1
They are definately all the same, i have changed many and they are no different.
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