Not sure what it is but I bought 2 of these and both times had problems with the T-valve on both installations. I had to add a lot of teflon tape to create a good seal around the fittings and prevent leakage. The problem with this is that many flush tank fittings are made of plastic. It is metal and will destroy plastic threads or fittings if overtightened or installed incorrectly. I bought a completely different vaporizer and had no problems compared to this one. [Update: I have since purchased 4 more of this particular item. Especially because of the coiled hose that allows it to stay off the ground. If I had problems with my previous two purchases, the problem may have been with the toilet faucet. 4 that I recently installed for my family's house, simply installed. I'm giving an extra star here.]
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