I purchased a starter kit directly from mistking's site, and added a zip drip, and upgraded to a double head nozzle instead of a single. My question is, shouldn't the nozzle have a T plug on top, and not just a 90* elbow? Otherwise there is no return to the zip drip as the instructions indicate it should create a loop. They didn't send a T to me, which seems ridiculous if I need it for the zip drip. I just need clarification, and then direction on which to buy. I see 2 different T plugs on Josh's Frogs page and they are the same price.