Guerrilla Air Myth Tank Regulator - 4500 PSI Tank This is the regulator that is destined to take its' place in the annals of Paintball, as the one that rendered all other screw-ins obsolete. This will only work on 4500 PSI tanks. -- Authentic Guerrilla Air Myth Regulators. These regulators are in stock and ready to ship!!!! * An astounding less than ¾" in length from ASA to bottle. * An unimaginable lite regulator. * Virtually instantaneous recharge. * Rebuildable. * Replaceable head tip (for those accidental dings to the o-ring gland). * User Friendly.