Correct dimensions for a Jackson whitewater kayak drain plug prior to 2015-ish when they changed plugs. Yopsolo's plug fits, but is about 3mm too long to bottom out correctly on my kayak. Shortened the threaded portion, filled the center hole (If I feel ambitious later I might make a stopper for the inside, passthrough a cord and pot with epoxy), and removed the lower fingers. Haven't tested on the water yet, but it should be just fine. Printed mine with both ASA and PETG.