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Well, I do agree with you, and I have dug into this a bit more. I originally posted from work and was going off memory. The valve I have, is this... Turns out it's a thermal expansion valve, and not a trap primer. I guess I have this because my house is newer and is plumbed with pex which...

I live in a four year old house. By code here, it is required to have a trap primer on any floor drain. My hot water heater (in basement) has a drain beside it which the trap primer flows into, which is fed by the cold water inlet of the hot water heater. For about three years now, the flow...