Instead of this discontinued prodcut, you should get a 48/3000 Compressed air tank
The In-line On/Off Valve eliminates the need for an on-off valve on every air-supply tank that you own. This allows you to convert any air-supply tank to on-off control. It also eliminates air waste that occurs when the air supply is removed from the marker or remote system.
To remove the air supply, simply turn off the On/Off Valve. That's It! No unscrewing needed. Since the air supply is not being removed from the marker under pressure, the marker and tank are saved from wear and tear. Damage to the bottle O-ring is also eliminated. Works with any pin-valve Co2 or N2 tank! Does not require a rail mount.