I have a Dish 6000 and a 508 with a SW34 switch out back. I believe that product is the very power inserter they had to install to get it all to work together.
Yep, exactly that's what I have, DP34 (DVR 510 says DP34-500).
Thank you very much for all the quick answers, I'm ordering it from Dishstore.net right now.:up