https://www.airguns4patriots.com/huben-k1-accessories/huben-k1-replacement-fill-port/huben-k1-replacement-fill-port/
The above is side 6000psi gauge and has a male foster with check valve on the end, it comes with the foster and gauge. I ordered two of them. Regards, Tom
Got one on the way but shipping was stupid expensive!
Edit: Maurice contacted me after I ordered and told me that there is a software glitch that is not allowing USPS Priority mail to be chosen but the order will ship Priority Mail and any excess will be refunded. I am much happier now! lol
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