Quote Originally Posted by MadMojoMonkey View Post
The shape of it reminds me of the sewer traps you see under any plumbing drain. Their purpose is to trap the stank sewer gas behind that fluid blockage that collects in the bend.
Yeah I definitely think it's a gas trap of some sort. My thinking was if there's a vigorous reaction in a test tube releasing gas, this little thing will stop is spewing over and ensure that what comes out is only gas. But I really am just guessing, I've never seen one before. Got hundreds of the little buggers.