TubFlex 4N-B MODX™ SMC Bath Module – 3-Wall Tub Surround with Split Back Panel & Recessed Niche
The TubFlex 4N-B MODX™ Bath Module is a complete three-wall alcove tub surround system with a split back panel and integrated recessed niche. Although it is a 4-piece model, it is not a four-wall system. It includes two side wall panels and a back wall assembly made from upper and lower sections.
During installation, the two back wall sections are assembled together to create one complete back wall. This structure reduces package size, improves handling, and makes the product more suitable for parcel-friendly shipping.
With its recessed niche, interlocking panel design, and tile-look high-gloss SMC finish, TubFlex 4N-B is a practical solution for remodelers, builders, hospitality projects, multifamily developments, and dealer distribution.
4-Piece Configuration
The 4-piece configuration means the back wall is split into two sections. The product remains a complete three-wall alcove surround system. The split back panel design helps reduce packaging size and supports parcel shipping while still forming a full back wall after installation.
Key Features
- Complete three-wall alcove tub surround system
- 4-piece configuration with split back wall
- Integrated recessed niche for built-in storage
- Back wall ships in upper and lower sections
- Parcel-friendly packaging design
- Interlocking panel system for secure assembly
- Tile-look high-gloss SMC finish
- Designed for standard alcove bathtub applications
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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.