Art,
Doing the research on these the toilets I found that there is a minimum pressure they need to have to force the valvd closed. I seen in other forums that certain Thetford models have had this issue. You are right that it does not fix the problem with the toilet but in lieu of replacing the toilet I installed this valve. Now we turn this on and off during each use and take no chances, certainly do not want another late night clean up.
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Les and Sue Young, 2009 Int 4400 LP, 2020 DRV Mobile Suites [/url] https://ramblingrvrat.blogspot.com/2019/11/freedom-from-grid-rambling-rv-rats.html[/url]
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