McMaster is exactly where I got my 3/4" NPTF x 5/8" Hose connectors, which I am using on my MD-20-RZT. The inside diameter of those fittings is exactly the same as the inner diameter of the inlet inside the 3/4" NPT connectors on my pump. I don't know about the 30, but I know that you can buy the 20 with a 5/8" barb to begin with.
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Michael E. Robbins
M.A.Sc. Candidate, University of Toronto
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