Not universal - unless the cover of some pistons is damaged. I didn't think I had to measure the piston. I think it will collect water without sealant? You can, but I don't think it's that wet when I put the plunger back in. He's a good weight. It's not very heavy, but it won't travel far unless specifically moved. Not super heavy, but a little heavier than they say. - This will prevent the ram from making direct contact with the ground. - If your pestle is small enough, the cover will probably make it a little prettier. Will i buy it again? Well I have another bathroom I need and I think I'll try something different JUST because I had to break the lid off. I could still go back and buy this one after trying another because it's a good price even as a weighted tray that gets the job done. Cons: IF you need a cover because you put the plunger in a space where the cleaning robot can touch it. And then you have to pry open the lid, that's definitely not going to serve any purpose. Luckily my vacuum robot doesn't get into the corner where the plunger lives because the space between the wall and the toilet is smaller than the vacuum cleaner itself. But something to note.
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