Just remove flange adaptor from spout.|Thread onto nipple extending from wall until snug.|Install spout into the adaptor and rotate clockwise until flush with the wall. | adjustable thread connect spout, fits either 3/4 inch NPT or 1/2 inch NPT pipe with included reducing adaptor. Features 1 inch telescopic adaptability for pipe extending 3/4 inch to 1-3/4 inch from the wall for the easiest installations. Celcon thread-connect chamber allows spout to mount flush to the wall for a neat, fast job. Durable metal construction for long service. Simple NPT pipe installation.