The Ninja Thread Protector in red color is a nice safety device to protect your tank's threaded output . Fits on top of the regulator to protect it when not in use. Helps prevent air leaks in the future. High quality CNC metal made, includes its own o-ring as wellFits on all paintball tanks (ASA adapter fit). This is a must-have for airsoft players that store or transport their tanks. Replaces the cheap plastic protector you probably already lost. Red color so it's harder to lose. Made of metal for long durability.