Need to reduce the thread size of a 9/16" female threaded Scuba regulator low pressure hose to 3/8" threaded male? This adapter converts standard low pressure regulator hose so that both ends are male threads. Adapter is made from durable corrosion resistant back finish chrome plated brass and comes equipped with Viton O-ring; Factory-cleaned so it's ready for Nitrox out-of-the-box. Designed for low pressure only below 200 psi (13.8 bars), changes 9/16-18 female to 3/8-24 male. Adapter makes a great save-a-dive-kit item and is easy to install.