What you could do is on my durso, there was a 1" pipe coming up out of the bulkhead and a 1" to 2" slip reducer. If you used a dremel and knocked down the little lip inside the reducer you'd have a few inches of adjustment for fine tuning the water height. I don't know why I didn't think of that sooner because when I set mine up I kept taking the pipe out and taking like 1/4" off at a time until I got it where I wanted. Doh.