Found the kits on eBay (4 for $19.95). I was looking for DWC Drain Kit. It was under DWC Site Tube / Drain Kit. Wont pop up if you just put drain kit. You have to put in site tube also. It appears my problem is with the washers / grommets or whatever those beveled type of rubber plugs are called.
My elbows are screw on with a nut on it on one side & barbed on the other end. Looks like I bought the wrong elbows too. Anybody got pictures of each part with the name of it as they sell it at Home Depot & the sizes ? I know that's asking a lot. I'm just so sick of spending money & time on things that don't work. Seems everything I do costs me 2 - 3 x's what it should because I always buy the wrong stuff when I don't have pictures to go by. Actually I just need a good clear picture of that rubber grommet piece & the size & name of it. That would solve my problem. I can't tell if there's a groove in it or what from the eBay pics. I'd order the kits but I don't think they'll get here fast enough. Here's the eBay kits. Just don't know what type of washer that is.
(DIY- kit is perfect for adding to or draining your hydroponic reservoir as well as to monitor your water level without lifting the lid or disturbing your plants. 4) - 1/2" Barbed Elbow. 4) - Hose Support DLT Clip.
www.ebay.com