This USA made stainless steel valve is compatible with the following:

• FX Impact, FX Impact Mk11, FX Impact M3
• FX Crown, FX Crown Arrow
• FX Boss
• FX Royale 500, FX Royale 400
• FX Verminator, FX Verminator Extreme
• FX Maverick

Fits any bottle with M18x1.5 neck threads.