Schluter Systems KERDI-SEAL Mixing Valve Seal, Waterproof Shower Valve Gasket Membrane - 4-1/2" (KMSMV235114)

Product Features: 

• Authentic Schluter® KERDI Waterproofing Component: The Schluter KMSMV235114 KERDI Mixing Valve Seal is a genuine Schluter® accessory designed to create a reliable waterproof seal around shower mixing valve penetrations. It integrates seamlessly with the Schluter® KERDI waterproofing system for professional shower installations.
• Designed for 4-1/2" Mixing Valve Openings: Specifically engineered for 4-1/2-inch (114 mm) mixing valve penetrations, ensuring a precise fit that helps maintain the integrity of the waterproofing layer around the valve body.
• Preformed Waterproof Membrane with Flexible Gasket: Manufactured with Schluter® KERDI waterproofing membrane and an integrated flexible rubber gasket that forms a secure seal around the valve, helping prevent water from penetrating behind tile and into wall cavities.
• Protects Against Moisture Damage: By sealing one of the most vulnerable areas in a tiled shower, this mixing valve seal helps reduce the risk of leaks, mold, mildew, and water damage to moisture-sensitive wall substrates and surrounding building materials.
• Fast, Professional Installation: The factory-fabricated design eliminates the need to cut and build custom waterproofing around the valve opening, saving installation time while providing a clean, consistent, and reliable finish.
• Compatible with Schluter Shower Systems: Designed for use with Schluter® KERDI waterproofing membranes and integrates with complete Schluter shower assemblies, including KERDI-BOARD, KERDI-SHOWER components, DITRA, and DITRA-XL installations where applicable.
• Durable, Long-Lasting Construction: Built from premium waterproofing materials that resist deterioration in wet environments, providing dependable performance throughout the life of the tiled shower system.
• Ideal for Residential & Commercial Projects: Suitable for new shower construction, bathroom remodels, hospitality projects, multi-family housing, and commercial tiled shower installations where dependable waterproofing is essential.

Product Description:

The Schluter® KMSMV235114 KERDI Mixing Valve Seal is a premium prefabricated waterproofing accessory designed to create a dependable seal around 4-1/2-inch (114 mm) shower mixing valve penetrations. As part of the trusted Schluter® KERDI waterproofing system, this seal helps maintain a continuous waterproof barrier, protecting walls and underlying building materials from moisture intrusion. The preformed KERDI section features a thin 4-mil membrane construction that minimizes material build-up around the valve opening, helping maintain a flatter surface beneath bathroom tile, shower tile, and other tiled wall coverings.

Constructed from genuine KERDI waterproofing membrane with an integrated flexible rubber gasket, the seal forms a tight fit around the mixing valve while bonding securely to surrounding waterproofing membranes. This factory-made design eliminates the need for complicated field fabrication, making installation faster, cleaner, and more consistent than traditional methods. The over-molded rubber gasket is incorporated directly into the prefabricated membrane section, creating a purpose-built waterproofing component for plumbing protrusions passing through KERDI, DITRA, or DITRA-XL membrane assemblies.

The KMSMV235114 helps prevent water from entering vulnerable wall penetrations, reducing the potential for costly issues such as mold growth, mildew, wood rot, and structural water damage. Its durable construction is engineered to withstand the demanding conditions found in tiled showers, steam showers, and other wet-area installations. At the mixing valve penetration, the seal also protects moisture-sensitive backing panels located behind the finished shower wall, providing targeted protection at an area where plumbing openings can interrupt the surrounding waterproof membrane for tile installation.

Designed for compatibility with the complete Schluter® Shower System, including KERDI membrane, KERDI-BOARD, KERDI-SHOWER assemblies, DITRA, and DITRA-XL, this mixing valve seal is an ideal solution for professional contractors, tile installers, and DIY homeowners seeking long-lasting waterproof protection. Its compact prefabricated format makes it a practical shower waterproofing accessory for bathroom tile wall assemblies, tile backer board installations, waterproofing membrane systems, and tiled wet-area projects where dependable sealing around a mixing valve is required.

Whether you're building a new shower or renovating an existing bathroom, the Schluter KMSMV235114 KERDI Mixing Valve Seal provides a simple, reliable, and code-compliant solution for protecting one of the most critical waterproofing penetrations in any tiled shower installation. For proper storage before installation, the membrane should be kept at temperatures above freezing at 32°F (0°C) and protected from UV exposure. These storage requirements help keep the prefabricated KERDI seal ready for use in shower waterproofing, bathroom shower waterproofing, shower wall, and waterproof membrane applications.