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I thought that too but we put em in the bathtub after the first time netting with them and they floated may be the goop but they floated fairly well.Yes it ABS the tubes we cut to 12" and it is 3" ABS and the caps are just added length we opted to get the really cheap caps as opposed the expensive ones because the cheap ones had holes in the already and i want worried about a watertight seal And yes the holes took a while to drill with a hand drill and no vise. Milk crate and zipties my new vise. and for my buoys i drilled a hole in them and put a 3oz weight to ballast one side down then drilled a hole in the top to stick a glowstick in it. Then for my rope I run my rope through the buoy and i use a 10 oz weight and clip it to the end of the rope and just throw the rope out so it sinks drop the buoy in the water then the net and it will free slide through so you never have to worry about adjusting for depth on your rope and the glow stick is always out of the water and i covered them in reflective tape.
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