Huben K1 Moisture Trap tank end-cap
If your compressor or hand-pump doesn't have moisture removal capability or you just want more protection for the internals of your K1, this might be the option for you.
You loose the ability to have a pressure gauge on your gun, but most pumps and compressors have better quality gauges on them and you know your pressure when your filling. With a bit of practice and experience you will know if you can shoot 1 mag or 10 mags before you should refill, so a gauge on the rifle really isn't needed.
This assembly comes with some moisture capturing material, I could be paper, cotton, desicant, what ever material you have available can give you added moisture protection. This is all external to the high pressure tanks and no tools are needed to inspect and change the moisture trapping material.