Dimensions: 3.0-Inch x 3.0-Inch * Steam head hole measures 1" and the actual NPT male threads (made of Copper or Brass ) are 3/4-Inch * Steamline should protrude 1/2-Inch from finished surface. * Steamhead to be mounted 18-Inch above the finished floor or 6-Inch above the rim of the tub and as far from the seating area as possible * Polished chrome