Part F 4In Adapter Alum,The PT Coupling Adapter is a versatile connector designed for various applications. It features a 4-inch Type F connection on one end and a 4-inch MNPT (Male National Pipe Thread) connection on the other end ensuring compatibility with different systems. Constructed from lightweight aluminum it has an inner diameter of 3.78 inches and a length of 4.79 inches. This adapter can handle a maximum operating pressure of 150 psi and includes a 0.4-inch chain lug extension. It has an exposed length of 3.19 inches and weighs 2.480 pounds making it a suitable choice for fluid connections where weight considerations and moderate pressure requirements are important.,