any help trying to figure out which hose it is?
this is the only pic i've got and it doesn't show it

goes from the bottom of the header tank (hose not shown) and then t's off when it gets to the little thingy with the triangle on the top of it in the middle of the picture and then goes off and joins up to the bottom of item 5 to the little pipe at the bottom

any help on getting a part number for this pipe please? it's got a part number on it but i can't read it without taking the pipe off, and i can't take the pipe off without pulling the undertray out again