Brass 2-1/2"x2-1/2"x1-1/4" Tee. Brass Pipe and Fittings are manufactured for both commercial-industrial and residential standards. Brass has a high level of tolerance, making it ideal for oil, water, and air line applications. Brass fittings are universal, they can be used by professionals and DIY guys. This 2-1/2"x2-1/2"x1-1/4" Tee is the fastest and easiest way to connect and reduce your gas/oil or water lines together. The bigger, 2-3", Tee's are typically used in gas and water lines.