mschloss
New Member
I recently replaced the flush seal (the red one) and the fill valve for a Mansfield 35 toilet that is 18 years old. After the tank filled I shut the water supply off. Even though I couldn't hear it refilling or leaking, the tank is empty when I check it the following morning. Should I install a new Mansfield tower style flush valve or can I replace it with a Fluidmaster 507A or 507C flush valve? There doesn't seem to be a good seal with the flush seal. Thanks for your help.