2 x 3 Part B Aluminum Reducer Coupler/Male National Pipe ThreadThe 2" x 3" Type B Aluminum Reducer Coupler Male National Pipe Thread is a high quality cam and groove fitting designed for secure and efficient hose to pipe connections. Made from lightweight yet durable aluminum, this reducer coupler features a 2 inch Type B female camlock connection on one end and a 3 inch male National Pipe Thread (MPT) on the other, allowing for quick and reliable coupling in fluid transfer applications. Specification Details