Maestrini 2.5"bsp pipe connecting compact elbow, male / female bop threaded, made from brass. A 90 compact bop pipe elbow is used to connect two pieces of equal sized pipe at a right angle where space may be limited or where higher flow rates are not required. Please Note: All fittings used for through hull applications must be correctly electrically bonded to ensure protection from electrolytic corrosion. Brass is susceptible to dezincification and is not recommended for below waterline through hull applications.