House of Rohl 1/2″ Pressure Balance Rough-in Valve with 1 Function Unfinished R51-SPEX

The House of Rohl 1/2″ Pressure Balance Rough-in Valve with 1 Function (R51-SPEX) is engineered to provide dependable water temperature control, long-lasting durability, and exceptional performance for premium bathroom installations. Designed for compatibility with a wide range of Perrin & Rowe®, Riobel®, and ROHL® trim collections ending in -51 (sold separately), this rough-in valve forms the reliable foundation of a luxury shower system.

At the heart of the valve is an advanced pressure balance mechanism that continuously monitors and adjusts the ratio of hot and cold water. This technology helps maintain a consistent water temperature even when water pressure fluctuates elsewhere in the home, providing greater comfort and enhanced safety during every shower. Whether another faucet or appliance is in use, the valve responds automatically to help reduce sudden temperature changes.

Designed with one simple control mechanism, the valve offers intuitive operation while delivering your preferred water volume. It can be configured to operate a standalone showerhead or a showerhead with a tub spout featuring an integrated diverter, making it a versatile solution for both shower-only and tub-shower bathroom layouts.

Built from solid brass, the R51-SPEX offers outstanding strength, corrosion resistance, and long-term reliability. This premium construction ensures dependable performance behind the wall while meeting the expectations of luxury residential bathrooms. The unfinished exterior is intended for concealed installation, allowing your chosen decorative trim to provide the finished appearance.

Installation and servicing are simplified through thoughtful professional-grade features. The integrated service stops allow maintenance to be performed without shutting off the water supply to the entire home, minimizing inconvenience during repairs or cartridge replacement. Additionally, the included test cap enables plumbers to pressure-test valve connections before installing the finished trim and cartridge, helping protect internal components from damage during construction.

The valve features a recommended 1/2″ NPT inlet connection, making it suitable for many standard residential plumbing systems. It also delivers an impressive flow rate of up to 5.8 GPM (22 LPM) at 60 PSI, providing the high-volume water delivery needed for a satisfying and immersive shower experience.

Ideal for homeowners, builders, designers, and renovation professionals across Canada, the House of Rohl 1/2″ Pressure Balance Rough-in Valve offers the reliability, flexibility, and premium engineering expected in luxury bathroom projects. Backed by a limited lifetime warranty, it provides lasting peace of mind and dependable performance for years to come.

Key Features

• Pressure balance technology maintains consistent water temperature.
• Single-function valve with simple one-control operation.
• Compatible with Perrin & Rowe®, Riobel®, and ROHL® trims ending in -51 (sold separately).
• Supports a standalone showerhead or a showerhead with an integrated-diverter tub spout.
• Durable solid brass construction for long-lasting performance.
• Service stops allow maintenance without shutting off the home’s main water supply.
• Test cap protects the valve during plumbing pressure testing.
• Recommended 1/2″ NPT inlet connection.
• High flow rate of 5.8 GPM (22 LPM) at 60 PSI for a luxurious shower experience.
• Backed by a limited lifetime warranty for added confidence.