Thanks for the tip. I never thought about carboy caps.
When I took the stem out of my others, and had the tops cut out, each keg had a brown residue on the inside that I had to soak(oxyclean) and scrub vigorously! What is the best way to get them clean since I won't be able to get inside and scrub them?? I am already contemplating putting legs and a dump valve on them. Have you ever seen a set up like that??