It is not a double tee, it is a cross, and it has application for vent systems.
I have seen "inspector's guidelines" in one jurisdiction which require that the two fixtures have the same level for use of a DOUBLE FIXTURE FITTING (so a kitchen sink and lav might not work for someone demanding this). However, UPC does NOT seem to require this.
Anyone else see this "same level" requirement?
This is awkward, but...
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