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That's exactly what I did, (6" round screw-in), just starboard of the step/keel line tube. That allowed me to look within and do some minor coverage in the suspected bad spots.
Please note that it is a SCREW-IN port cover. They presently cost around $20.00 or so from WM. Doing some calculations, I figured out the pressure would be no greater than 5 to 8 psi. Using the screw in type port will hold a bit more than that. The pop-in type will eventually get loose and it would start leaking, that plus it could be likely the pop-in type could flex a little and you'ld have a part time leak. Their the worst kind because of the difficulty finding them.
Sae you, George E. Norkus
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