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

The House of Rohl 1/2″ Pressure Balance Rough-in Valve with 1 Function (R51-EX) is a premium rough-in valve engineered to provide dependable water temperature control and long-lasting performance for high-end residential bathrooms. Designed to work seamlessly behind the wall, this essential plumbing component creates the foundation for a safe, comfortable, and reliable shower experience while maintaining the elegant performance expected from House of Rohl products.

Featuring advanced pressure balance technology, this valve continuously monitors the ratio of hot and cold water entering the system. If pressure changes occur due to other fixtures being used elsewhere in the home, the valve automatically adjusts the water mix to maintain a consistent and comfortable temperature. This helps reduce sudden temperature fluctuations, enhancing both safety and everyday comfort for the entire household.

The valve is designed with one simple control mechanism, making it an excellent choice for single-function shower applications. It can operate either a standalone showerhead or a combination showerhead and tub spout when paired with a tub spout featuring an integrated diverter. This flexibility makes it suitable for both shower-only installations and tub/shower combinations in modern bathrooms.

Constructed from solid brass, the R51-EX offers exceptional durability, corrosion resistance, and long-term reliability. Its robust construction is built to withstand years of daily use while maintaining dependable performance behind finished walls. The valve also features a service stop, allowing maintenance or cartridge replacement without shutting off the water supply to the entire home, reducing downtime and simplifying future servicing.

Installation is equally convenient thanks to the included test cap, which enables plumbers to pressure-test valve connections before installing the finished trim. This helps protect the valve cartridge during construction while ensuring a smooth installation process. The valve uses a recommended 1/2-inch NPT inlet connection, making it compatible with standard residential plumbing systems.

Designed for compatibility, the R51-EX works with all Perrin & Rowe®, Riobel®, and ROHL® trim kits ending in -51 (sold separately), allowing homeowners and designers to select the decorative trim that best complements their bathroom style. With a generous flow rate of 5.8 GPM (22 LPM) at 60 PSI, the valve delivers excellent water volume for a luxurious and immersive shower experience.

The unfinished design is intended for concealed installation behind the wall, ensuring that only the selected trim and fixtures remain visible for a clean, sophisticated appearance.

Ideal for luxury bathroom renovations, custom home construction, and premium remodeling projects across Canada, the House of Rohl R51-EX Pressure Balance Rough-in Valve combines advanced engineering, dependable safety features, and exceptional craftsmanship. Backed by a limited lifetime warranty, it offers homeowners and professional installers lasting confidence, reliable performance, and the quality expected from one of the industry’s most respected premium plumbing brands.