The 3.5 inch plug was missing from my cleaner. The cleaning cap that mates with the connector has been split at 1/8 inch increments. Both the vertical tube and the cover were misaligned. To make matters worse, the cleaning cover was between the concrete road and the concrete parking lot, so I couldn't replace the cover or fix the misalignment. At first I tried a solid butt without success. This type of plugin worked despite the game's many unusual features. Installation took less than a minute. And when I tried to pull it out, it wouldn't budge. The design of the plug can be easily improved by reducing the profile of the protruding stud/nut so that these parts do not protrude from the cap. When it's open, it's easier to remove, and the hoops put an uneven load on the cork. City robbers steal and destroy things regularly and this may be the reason why the original plug is missing.
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