Yep. 3/8" He's always been tight with a buck, and it saved a lot of copper.
Latest thing with the same guy: sometimes the light in the bathroom flickers but mostly won't turn on at all. I jabbed the probes of my trusty multimeter into the non-GFCI socket by the sink and discovered that both hot and neutral were live. Been about two weeks, still waitin' to see he gets it fixed before the house burns down.