It may not IF there is a working head
on the boat that does not meet requirements. Their enforcement efforts will be directed towards the illegal head
not the legal
porta potti. You may want to call the CG to confirm this but you may have to disable the existing head in some way before they will ignor it. Also check into the requirement of a porta potti. I looked into this several years ago and as I recall
there are regulations
for fastening it to the boat and not all models meet the requirement.