A small question on code requirements. An air gap is needed between the faucet and the bath tub fill level. Is the fill level at the rim of the bath tub, or is it at the overflow level? I have a American Standards Reminiscence bath tub, and a goose neck faucet. I was hoping to be able to place the faucet on the side of the tub, on a tiled surface, instead of on the tub's rim, but this tub protubes a lot above the tiled surface, bringing the rim level very close to the faucet (even if the overflow is way lower).
Thanks, William D.