So this adapter should go from a 2" x 3" bottom spigot (something like that I think) to a 4" Schedule 40 corrugated tube and it does. The Actual dimensions of this piece are 2.5" x 3 5/8" x 3.5". Although this fits over the bottom spout, it leaks and wobbles; it's too big. The round side is small enough to fit in a 4" tube. The locking tabs hook into the tube's fins, but don't hold very well as they aren't fully engaged. Again, like the Titanic, this connection is sealed Expect a watertight seal, but the connections shouldn't dangle or wobble.
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