Rock in my P-Trap

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Old 09-08-13, 05:47 PM
Marie B. LePage's Avatar
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Question Rock in my P-Trap

I'm a newbie homeowner and working on teaching myself how to do my home maintenance (e.g. I just cleaned out my dryer exhaust ducts today with a brush and a conduit).

Today I explored the floor drain in the utility room by removing the drain cover (which was covered in goop and rust [we have very hard water]). Once I cleaned out the junk in the top of the trap, I discovered there was a rock floating at the top of the trap. It's just big enough I can't easily get it out.

My question is - is this some kind of crazy method of keeping the sewer gas out or something and I shouldn't keep attempting to remove the rock...? I mean,... WTF, right?
 
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Old 09-08-13, 05:52 PM
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Welcome to the forums! Physics 101....rocks don't float Most likely what you encountered was a float to do exactly what you thought. It keeps water from backing up in the pipe and entering your utility room. The actual trap is located below this and will keep the sewer gasses out.
 
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Old 09-08-13, 05:58 PM
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I was pretty sure rocks didn't float either, but I just couldn't figure out what the heck was up with that! Does it make sense that I could push it down into the drain? Like this floaty thingy isn't hinged to the top of the pipe or anything, it's just a floaty thingy that moves back and forth in the drain depending where the water is?
 
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Old 09-08-13, 06:14 PM
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It will follow the water up and plug the pipe. Basically it is a ball that free floats.
 
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Old 09-08-13, 06:17 PM
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Here's a bunch of pictures of backflow preventers.
floor drain backflow preventer - Bing Images

Look like one of these?
 
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Old 09-08-13, 06:33 PM
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It doesn't, but then again, my drain is rusted to the core. It's hard to know what it actually "looks like".
 
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Old 09-08-13, 07:05 PM
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Does this image help?
Name:  1267509_743421596941_1834833584_o.jpg
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