We can provide other CO2 or PUMP to PCP solution. The valve is sealed by high pressure, it won't leak when the pressure up to 34MPa.Main cylinder is made of titanium alloy, working pressure is up to 30mPa (1mPa~10bar~150psi). DO NOT disassemble the installed part when you get them. To install them, you only need to keep original barrel, grip & trigger set, and Push Pin. Please choose the right length of cylinder. This item is in the category "Sporting Goods\Hunting\Hunting Accessories\Other Hunting Accessories". The seller is "free_outdoor" and is located in this country: CN. This item can be shipped worldwide.