Think of spaflex as exactly the same as your rigid PVC, except that it bends. You wouldn't need a hose barb for it, just your regular PVC fittings.
Now, I have a Rio 32HF on my ritteri tank and I don't remember it having NPT thread option, I'll have to look at it again. I just used a 1' section of vinyl hose that slips over the output and then a hose barb and then into my return plumbing manifold. But if it does have the NPT option then you just need whatever adapter to fit into it. Either a MPT that threads right into it, or a FPT that the pump threads into, or you can use MPT with a close nipple if need be (might be the easier option if your using a bushing to step up the plumbing size, for example)..
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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