I bought a 4" x 5" adapter. Nowhere in the description are the actual dimensions of the reducer given, but I assumed the inside diameters of the sides would be very close to 4" and 5" which would give a fairly snug fit even before the hose clamps were tightened . Unfortunately, the diameters are a bit larger than expected for my purposes. On the 4" side, the inside diameter is 4 3/8" and the outside diameter is 5 1/8". On the 5" side, the inside diameter is 5 1/2" and the outside diameter is 6 1/4". ". ". These sizes do not fit me. I really wish they were included in the description. It would save me the time and hassle of returning it.
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