When air tanks are being stored or transported simply screw on the HK Army Thread Guard to ensure the compressed air regulator and C02 tank threads stay protected from damage. Also equipped with the Thread Guard are two spare o-rings securely mounted on top for those unforeseen moments the tank o-ring breaks at the paintball field.
Thread Protector Details:
Machined aluminum cover
Screws onto top of tank regulator
Lasered HK Army Icon Logo 
Fits all paintball air system regulators
Includes two spare tank o-rings