Does a joker valve do the same thing as a check valve?
A joker valve is a one-way valve. So yes, it is a type of check valve. In an electric toilet it has only one function: to prevent backflow from the toilet discharge line. (It has another much more important function in manual toilets.)
Only a brand new one can block even slow SEEPAGE. Bowl contents passing through it stretches it a miniscule bit with each flush...it doesn't take long for the slit to begin to part enough to begin to allow seepage to occur. With more and more use the slit turns into a hole that couldn't even block a flood any more. How long that takes depends on how much use the toilet gets. It would get enough use on a live-aboard to replace it annually.
To answer your question, Terry...you should not be able to see any daylight through the "lips" of a brand new one. How long before you should beging to see any daylight...again, it depends on how much the toilet is used.
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