Please make sure that the valve is fitted by a qualified airsoft engineer as High pressure air can be very dangerous if used incorrectly resulting in significant bodily ham and/or fatal injuries. Please make sure that any air supply that you use with this HPA tap comes from a low pressure regulator. Do not attempt to use this equipment with unregulated air sources. Please note that fitting a HPA Tap is considered a custom upgrade and will affect your warranty on your airsoft gas blow back gun and your magazine.