TubFlex 4K MODX™ SMC Bath Module – 3-Wall Tub Surround with Split Back Panel
The TubFlex 4K MODX™ Bath Module is a complete three-wall alcove tub surround system designed for efficient installation and easier logistics. As a 4-piece model, it includes two side wall panels and a split back wall made from upper and lower sections.
Once installed, the two back wall panels combine to form a complete back wall. This configuration reduces carton size, improves handling, and supports parcel-friendly shipping, making it suitable for remodel programs, multifamily projects, dealer distribution, and builder installations.
With a tile-look high-gloss SMC finish and interlocking panel structure, TubFlex 4K provides a clean bathroom appearance with lower maintenance than traditional tile.
4-Piece Configuration
The 4-piece configuration refers to the panel count, not the number of walls. TubFlex 4K remains a three-wall surround system. The back wall is divided into two sections to reduce package size and support parcel shipping.
Key Features
- Complete three-wall alcove tub surround system
- 4-piece configuration with split back wall
- Back wall assembles from upper and lower sections
- Smaller package size for parcel-friendly shipping
- Durable Kostone SMC construction
- Interlocking panel design
- Tile-look high-gloss finish
- Suitable for project-scale bathroom programs
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Get Project-Based Pricing
Bulk pricing, project support, and U.S. warehouse availability may vary by product and quantity.
Product Overview
Built with Kostone SMC — a reinforced composite material engineered for strength, water resistance, and long-term durability, MODX™ combines wall panels, bathtub or shower base options, and integrated connection details into a modular bath system. It is ideal for multifamily housing, manufactured housing, hospitality bathrooms, builder projects, remodel programs, and dealer distribution.
Features an interlocking wall design that helps simplify installation, reduce alignment errors, and minimize the need for traditional caulking in key connection areas. Its direct-to-stud installation structure allows the module to be installed efficiently in new construction or renovation projects, helping reduce labor time and improve jobsite consistency.
Available in bathtub and shower configurations, MODX™ can include practical design options such as integrated corner shelves, back-wall niches, above-floor or under-floor drain compatibility, and flexible seat solutions depending on the project requirement.
Direct-to-Stud Installation
MODX Bath Modules are designed for direct-to-stud alcove installation, helping contractors reduce extra framing layers, simplify wall alignment, and create a cleaner installation path for repeatable bathroom projects.
- Installs directly to wall studs
- Supports faster on-site assembly
- Helps reduce installation complexity
Interlocking Panel System
The MODX interlocking design helps wall panels, shelves, and tub or shower components connect in a more organized way. This supports better alignment, cleaner seams, and a more repeatable installation experience across similar bathroom layouts.
- Interlocking wall panel design
- Cleaner alignment between components
- Built for repeatable project layouts
Product Specifications
Product Type
SMC bath / shower surround system
Material
Kostone SMC / Sheet Molding Compound
Installation Type
Alcove installation
Shipping Options
U.S. warehouse shipping or factory-direct project supply
Project Applications
Residential remodels, multifamily housing, manufactured housing, hospitality, senior living, dealer distribution, and builder projects
FAQs
Please read to find out more.
What is Kostone SMC?
All Kostone products are crafted from SMC (Sheet Molding Compound) composite. Stronger and more durable than traditional acrylic, with excellent water resistance to ensure long-term performance in wet areas.
What is MODX Bath Module?
MODX Bath Module is Kostone’s modular SMC bath system designed for faster installation, easier handling, and scalable bathroom project delivery. It is available in bathtub surround and shower surround configurations.
Is MODX Bath Module designed for alcove installation?
Yes. MODX Bath Module is designed for standard three-wall alcove bathroom applications.
What is the difference between 3-piece and 4-piece MODX systems?
Both 3-piece and 4-piece MODX systems are complete three-wall alcove surround systems. The difference is the back wall panel configuration.
A 3-piece model includes two side wall panels and one full-size back wall panel. This creates fewer back-wall joints, but the package is larger and is typically better suited for freight or project-based delivery.
A 4-piece model includes two side wall panels and a split back wall made from upper and lower sections. During installation, the two back wall sections are assembled together to form one complete back wall. Because the back wall is split into two smaller panels, the overall package size is reduced, making the system easier to handle and suitable for parcel-friendly shipping.
How long does MODX take to install?
MODX is designed for fast installation. It would take about 2-3 hours, compared with 1–3 days for tile installation.