is half the thickness of Kerdi membrane at only 4 mil. This helps eliminate build up. Kerdi Seal MV is a section of Kerdi waterproofing membrane with overmolded rubber gaskets that will seal pipe extrusions. Kerdi Seal MV has a mixing valve opening diameter of 4-1/2".
Kerdi Seal Features over molded rubber gasket , and are used to seal pipes protrusions, and allows to protect sesitive areas, from moisture when used with the kerdi system it gives a perfect seal.
You will be getting one new mixing valvue gasket 4 1/2" diameter opening.
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