Made of marine grade brass with triple bright chrome plating, this valve is meant to last. Precision machined from high tension brass and chrome plated valve stems extend the life of the valve by years. The valve is cleaned for pre-blended Nitrox up to 40% FO2. Includes Viton O-rings, and is lubricated with Christo-Lube MGC-111 Lubricant. Equipped with a soft rubber wheel, copper crush washer sealed bonnets, one-piece safety plug, hex wrench Dip Tube and fits nearly all aluminum and modern steel cylinders. The essential choice for the serious diver.