I have bought 2 of these in the past from two different vendors and neither one fully latches on my Crown.Steve,
Seems like the simplest solution would be to contact FX, explain your problem, and ask if they can supply or recommend the proper female foster fitting.
I see that Air Tanks Plus has an extended fitting and states: "This is needed to fill PCP airguns that have a recessed fill port like the FX Airguns do."
Male Quick-connect with Female Quick-connect XL Adapter – Stainless Steel
Longer FX friendly female quick-disconnect fitting. Used to fill PCP airguns with recessed fill port like the FX Airgun. No Tools Requiredairtanksplus.com
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