

One of you know the name of this thing?
It says on the visible part of the label “Thermal expansion relief valve”, but I’ve seen three of these things in lieu of a ball valve for an ITV. When I rotate it 270 degrees to the open position, water flows about what seems right, but I want to know if this is a code compliant ITV. For the record, the outlet has a smooth restricting orifice representative of the smallest head in the system, so that isn’t an issue.