go to best fittings and order a couple of

BEST Fittings Fill Valve Upgrade For Air Arms T Bar Type Valves Only​

$15.83 , get two incase of a problem , usually takes - 2-3 weeks from the Uk , i did my old 410 and am going to do my 510 when i feel like it , if its a gun you shoot a lot i would do it . you'll be proud of your self for making things better! https://www.bestfittings.co.uk/
 
Last edited: