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Ya could get some more PIPE of that same size and cut that one, and add another longer piece into it to make it higher. Ya could weld it, braze it, likely solder it, maybe use some JB WELD or sumpin.... You have some options.
If you have spare time you could take a run down my way and install a new large shed for me and especially level the ground where it will go, remove the grass and dig down about 4 inches, spread paving stones in there and then place pavers on top that the 4 x 4 beams will sit on and have to be dead level five across with each other. Then we build a nice floor frame on top of those and top that with 3/4 inch plywood. Then we build the shed on top of that.
Something for a younger whipper snapper to do.... My back would not last fifteen minutes doing this much less the concrete work you have already done!
Great job sir! I am impressed.... Between you and Nemo you both make me tired just reading about what you two are doing! lol!!! 
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