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it's a 1" diameter rubber puck with a flat washer on each side. a bolt runs through the puck and joins the two washers. as you tighten the bolt the washers come together and compress the puck. the compressed puck squeezes outwards and seals the plug in the tube.
i found that, as i tightened the plug, it would expand inside the tube until i heard a 'pop'; that was the o-rings that hold the tube in place letting go. once they released it all pulled out without effort.
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