Part D 4In Coupler Alum,The PT Coupling Coupler is a robust and versatile industrial connector designed for various applications. It features 4-inch connection sizes on both ends with Type D on one side and FNPT on the other making it suitable for a variety of uses. Constructed from durable aluminum this coupler has a 3.6-inch inner diameter 6.56-inch outer diameter and measures 3.9 inches in length. It is designed to handle a maximum operating pressure of 150 psi making it suitable for industrial settings. Additionally it features 10.66-inch OD cam arms extended for ease of use and stability with a weight of 2.484 pounds. It comes equipped with an hBS 300 Series Stainless Steel Cam Arm for added durability and reliability in connecting applications.,