DESOLDERING SUCKERS Manual pumps suck up solder. Plunger pumps are light, strong, and economical. Self-Cleaning Shaft When the plunger is pushed, a piston extends out the nozzle. This prevents solder build-up. Plunger Lock Function The plunger can be stored inside the shaft by pushing it in completely, and pressing the vacuum release button. Compact storage. This product will be an excellent pick for you.