Thanks for your attention to my problem. Seems there"s a nipple in the back of the drain tank that will only accommodate a ribbed 1/2 hose. Good luck finding some if you need it. What I finally did was splice into the ribbed hose I had left and used a fresh piece at the nipple. Then I used about 1/2 a can of Rustoleom rubber sealant to close the thing up.
So far...no problems. Keep your fingers crossed for me.