I purchased a CB21V seal-off and there is a small tapped hole in the bottom of the valve. Is there a screw missing?

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No, there is no screw missing.

What you see at the bottom is the safety blow-off valve.  The seal-off is designed for a maximum pressure of 200PSI.  If the pressure in the system exceeds that, the valve will open and release additional pressure.

DO NOT under any circumstances close this hole.

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