Brass 2" Cross?. This Cross is a fitting that allows you to connect four separate pieces of pipe together, and make changes of direction in the pipe system. This Brass 2" Cross features four threaded female connections ideal for a snug and leak free connection when installed correctly. (Teflon tape or Pipe dope is required for a leek free connection) This Brass Elbow and other fittings are used in a variety of different plumbing applications. This Fitting is commonly used on oil, water, and air lines in residential applications and some light commercial applications also. This Fitting is easy to use for both contractors and the do-it-yourselfer. Its durable construction is very reliable and its ability to resist corrosion and rust make it a better choice over black iron or copper fittings.