The brush comes in two sizes, one at each end of the spring cord. It went into my long tube of about 18 inches fairly easily. Then there was no tension or stiffness compelling him to continue. When I tried to pull it out, the spring cable just went taut and the brush didn't move. Since this pipe is for an aquarium I can't put soap or anything in it to help it. I ended up with a spring loaded cable and a POS cleaning tool. Something short would be nice. Like 5".
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