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Benjamin Discovery valve block with slit wont seal huma air regulator sleeve.

First pic is my valve body. The slit keeps huma air spacer from sealing. I tried the option a and left gauge block in with front oring off. Leaked like a siv. With front oring on gauge block it seals fine but im guessing the reglator isnt working correctly.

Second pic is the smooth gauge block I need. Anyone have one to sell me. Or swap. This is a high flow valve body.
Hope this makes some sense. Thank you.

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