I think what you're looking for is this: http://www.homedepot.com/p/t/1001734...6#.UT3ZT478pMI

The trick is getting it up where you need it. With this in mind, I think beast556's suggestion is the best one. If you can't find the ones he mentioned with the 90' angle made specifically for plumbing, I'd recommend a pair like this: http://www.homedepot.com/p/t/1004884...4#.UT3aK478pMI - they're very versatile and have sharp enough teeth to grab things that a lot of other similar ones don't.