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The Kerdi-Seal-MV is a preformed polyethylene waterproofing seal with a molded rubber gasket, sized for a 4-1/2 in. mixing valve opening in a Kerdi shower. It bonds to Kerdi and Kerdi-Board to keep water away from moisture-sensitive backings around the valve. The 9-1/4 in. square sheet is mildew and mold resistant and carries a 10-year limited warranty. At $10.70 at Home Depot as of November 4, 2026, it sits at the low end of its recent range, with only two stores pricing it new.
Availability unknown
Availability unknown
Lowest price we've seen: $10.09 on Nov 5 at Lowe's. Tracked across 2 stores since Nov 5.
Rated 4.8 out of 5 from 53 ratings, buyers mostly report a clean, fast seal around the mixing valve. Complaints are few and center on fit and price.
Kerdi-Seal-MV is a prefabricated waterproofing seal with over-molded rubber gasket. It is designed to protect moisture sensitive backing panels at the mixing valve in Kerdi Shower installations. The KMSMV235/114 has a 4-1/2 in. mixing valve opening.
