RV Repair: Leaky Toilet in Sea View, leaky toilet, vacuum breaker

Question
I have a 2000 33 ft Sea View.  The toilet seems to be leaky at the top where the piping attaches to the toilet.  It is a screw on connector and I have tried tightening it and using plumber's tape.  Nothing has helped.

Answer
HI RON
MY GUESS IS A VERY SMALL PART CALLED A VACUUM BREAKER. LOOKS LIKE A LITTLE TOY DART. BUT DARN HARD TO GET TO FIND. THE TOILET HAS TO BE REMOVED TO GET TO IT. ONCE ITS REMOVED THE INSTRUCTIONS OF THE REPLACEMENT PART WILL HELP YOU REINSTALL.
CALL YOUR PARTS STORE FIRST AND GIVE THEM THE MODEL OF THE TOILET.(ON THE UNDERSIDE OF THE SEAT)TO SEE IF THEY HAVE A "BALL VALVE KIT" OR JUST THE VAC. BREAKER IN STOCK . YOU MIGHT AS WELL REPLACE THE BALL VALVE IF YOU HAVE TO PULL THE WHOLE TOILET APART. THAT WILL SAVE YOU FROM HAVING TO DO IT AGAIN.

THOM