The rubber membranes control the Saniflo on off functioning, sometimes bleach or water scale can make the membrane less flexible than it needs to be which results in a unit that is slow to turn on/off or continues to run.The replacment is fairly easy and can prolong the life of your system.
The Round Membrane fits the Sanibest Pro, Sanigrind Pro, SaniAccess 3 and SaniAccess 2 Systems.
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