Aluminum Stopper Kit. Ideal for high pressure systems, this kit contains an anodized Aluminum Neck Cap and anodized Aluminum Inner Washer, threaded for a 4-40 screw tightening screw. The kit also contains both 1/8″ \(3,18 mm\) and 3/16″ \(4,76 mm\) brass tubing, and both a white Glow Fuel stopper and black Gasoline/diesel/smoke oil stopper. Universal for all Sullivan tanks.