piston. It has a wooden handle and a rubber part of the butt. Nothing special about it, it does its dirty work, end. A few tips: 1) I bought three of these. Each seems to break down after about a year of low to moderate use. Maybe I'm diving too deep or they're poorly constructed, but for $10 it doesn't matter. 2) There is a rim inside to collect water and foam after use. I turn mine upside down to empty it after each use or else it gets foam and mold.
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