Spares available at: https://spares.bagnallandkirkwood.co.uk/
Fixing a leaking FX airguns bottle valve. This type is used on:
FX Crown & Crown MK2
FX Boss
FX Gladiator & MK2
FX Verminator & MK2
FX Impact MK1, MK2, M3
FX Maverick
FX Royale
FX Verminator & MK2
FX Wildcat MK3 BT