this offers you a interesting opportunity when you are putting the plumbing together for your aquarium and in short what basically what it does is it eliminates the need for a ball valve in your return plumbing and I know there's going to be a lot of people out there that still want to use them for whatever reason uh but it really with a DC pump it's no longer necessary so what I'm doing right here is I'm basically dry fitting the piping uh before I go out and start gluing it together and just kind of getting an idea of what I need before I make any permanent decisions and a lot of what I did with my return piping is kept it really simple and with that having the