Can seize up when it dries out, Flush & store plunger a little bit up off the bottom. Good for emptying boat live well, and cottage toilets at year end (when antifreeze is added). When the o rings dry up, almost impossible to pull plunger out. Suggest flush, and pull plunger back up before storing so you can push it down to get it moving. Even with tools I could not pull it up without potentially breaking it. Great tool otherwise, especially for the 2 uses mentioned above.