Fortis 4-Port 3-Way Diverter Valve Trim – Square, Matte Black, 84425SQMB

Fortis 84425SQMB 4-Port 3-Way Diverter Valve Trim – Square, Matte Black is a contemporary diverter trim designed to control multiple shower or tub outlets when paired with the Fortis VALVE425 rough-in. With its bold square backplate and matching metal handle, this trim coordinates with the Corsini, Gattinara, and Scala collections to help you build a cohesive, modern shower system. 

This complete trim kit includes the square metal handle, escutcheon, and a 4-port, 3-way ceramic disc diverter cartridge. When installed over the VALVE425 1/2" diverter rough valve, it allows you to distribute water from one inlet to up to three different outlets, providing flexible control over rain heads, hand showers, tub spouts, or body sprays. 

Key features

• Trim only: decorative diverter trim kit with handle, escutcheon, and ceramic disc cartridge; requires Fortis VALVE425 1/2" diverter rough-in valve for operation. 
• 4-port, 3-way diverter: supports one inlet and three outlets (4-port, 3-way configuration) for multi-function shower or tub systems. 
• Ceramic disc cartridge: smooth, durable diverter operation with long-lasting, low-maintenance performance. 
• 1/2" connection: designed for use with 1/2" diverter rough valve VALVE425, compatible with standard 1/2" plumbing. 
• Square metal handle & plate: solid brass trim with a square handle and backplate that match Fortis square valve and volume trims. 
• Collection coordination: coordinates with Corsini, Gattinara, and Scala collections for unified shower and tub designs. 

Matte Black finish (MB)

• Finish: matte black, offering a rich, low-sheen look that pairs well with black fixtures and light or textured tile for high contrast. 
• Durability: advanced finish technology helps resist everyday wear, scratching, and tarnishing while maintaining a consistent appearance. 
• Coordination: matches Fortis matte black shower heads, valve trims, slide bars, and tub fillers to create a cohesive, modern bathroom. 

Specifications

• Model: 84425SQMB – 4-Port, 3-Way Diverter Valve Trim, Square, Matte Black. 
• Application: tub and shower diverter trim (shower systems with multiple outlets). 
• Ports: 4-port configuration (1 inlet, 3 outlets). 
• Ways: 3-way diverter. 
• Connection size: 1/2" (via VALVE425 rough-in). 
• Cartridge: 4-port, 3-way ceramic disc cartridge included with trim. 
• Mounting: wall-mounted trim over rough-in valve. 
• Theme: contemporary / modern. 

Required rough-in (sold separately)

• Valve: 1/2" Diverter Rough-in Valve – VALVE425. 
• Features: ceramic disc valve, 1/2" NPT connections, 3-way diverter, approx. 9.7 GPM @ 60 PSI, with step-by-step installation instructions and limited lifetime warranty. 

Construction & benefits

• Complete trim kit: includes trim plate, square metal handle, and 4-port, 3-way ceramic disc cartridge for the diverter. 
• Flexible shower design: allows you to route water between up to three outlets (for example, a rain head, hand shower, and tub spout or body sprays), depending on your plumbing layout. 
• Smooth operation: ceramic disc technology ensures positive indexing between outlet positions and low-effort handle movement. 
• System compatibility: designed to work seamlessly with Fortis thermostatic and pressure balance valves and trims in matching finishes. 

Technical documents

• Maintenance & Installation (PDF)
• Parts Diagram (PDF)

Warranty

• Mechanical warranty: limited lifetime warranty on mechanical parts for the original residential purchaser. 
• Finish warranty: limited lifetime warranty on finishes in residential use; 1-year for commercial applications. 
• See Fortis warranty policy for full terms, exclusions, and service instructions. 

Frequently asked questions

Does 84425SQMB include the rough-in valve?

No. This is a trim kit with cartridge only. It must be installed with the separate Fortis VALVE425 1/2" diverter rough-in valve. 

How many outlets can this diverter control?

The 4-port, 3-way design supports one inlet and three outlets. When plumbed correctly, it can route water to three different shower components, either individually or in shared positions depending on system design. 

Which Fortis collections does this diverter trim match?

This square diverter trim coordinates with Corsini, Gattinara, and Scala collections, making it easy to match other square valve trims, shower heads, and accessories. 

Is the diverter trim lead-free and code compliant?

As part of a Fortis system with VALVE425, the assembly meets NSF lead-free, CEC, CALGreen, CSA, and ADA guidelines when installed according to instructions and local codes.