The attached picture is of a 3/8 inch water line that is connected to the cold water line under the sink in a bathroom. The bathroom is a full handicap bathroom with a shower designed to roll your wheelchair in, and a 2nd drain in the middle of the tiled floor for the occupant to drip into after the shower. This is the trap for the floor drain.
I wrote this up as a health safety hit because I don’t think you can connect potable directly to the drain like this. I got a call from the person who remodeled the bathroom saying that is was required for code for a drain that doesn’t have a fixture on it to allow you to put water in the trap. I told her I needed to do some homework.
Can you guys help me out? I am not finding it in the residential code. Mayby the plumbing code? I don’t have that one. This is a single family home. At a minimum I would think it would need some type of vacuum breaker or air gap type connection. I didn’t see it, but I am told it has a checkvalve.
Unfortunately I didn’t take a picture of the connection below the bathroom sink where it is tied to the potable line. It is a regular compression fitting shut off valve connected to a Tee in the potable line before the sink shut off valve. The subcontractor that installed the line says that there is a check valve. If I check that valve, and it is a trap primer or vacuum breaker valve, it might be ok. But, as Jeff pointed out, it would still need to be above the weir of the trap. Anybody got one of those real good diagrams that they could share?