This bathtub spout fitting includes a 1/2" nipple and coupler with a 4-inch MPT in black steel. It's compatible with all brands and models and suitable for oil, air, and gas. The round shape of the nipple has a diameter of 3/4 inches, with an interior diameter of 1/2 inch. The set includes a nipple made of high-quality black steel with an unfinished finish that enhances its durability. This unit is perfect for plumbing and fixtures in the home improvement sector and weighs 7 oz. The item has features that make it ideal for use with oil, air, and gas. Get this versatile and reliable nipple today for a great plumbing experience!