ROCA Duplo One Tank Under Window Adjustable Concealed Cistern

Bespoke Installation for the Demanding Space.

Luxury bathroom design is often a game of millimeters, and the Roca Duplo One Adjustable Under-Window Cistern is the winning tool for it. While standard low level cisterns offer fixed solutions, this adjustable variant is engineered for precision. Specifically designed for back-to-wall (BTW) floor standing toilets, it provides a flushing system that can be fine-tuned to fit the exact height requirements of your architectural features.

Precision Engineering Meets Total Versatility

Its standout feature is its adjustable height range, allowing for a custom fit starting from a compact 600mm. To ensure it integrates perfectly into your specific layout, Roca has designed the unit with dual mount flexibility, allowing the flush plate to be positioned either on the front or the top of the cistern. This means that even if your toilet is tucked deep under a shelf or window ledge, the controls remain ergonomic and accessible. Despite its versatile nature, it maintains a slender profile, ensuring your back-to-wall pan sits perfectly flush for that clean aesthetic.

A Sanctuary of Silence and Durability

The cistern is fully encased in an insulation jacket. This shielding serves two critical functions: it provides exceptional acoustic dampening for a quiet refill and acts as a thermal barrier to prevent condensation from forming on the tank. By eliminating moisture buildup, it protects the integrity of your internal walls and bathroom furniture, ensuring your investment lasts for decades.

Sustainable Flow and Effortless Upkeep

This cistern has a 6/3 litre dual flush allowing for significant water savings without compromising the powerful flush required for modern BTW pans. Maintenance is designed to be completely non-intrusive; all internal valves and working parts are fully accessible through the flush plate aperture.

Key Features

• Adjustable Low Height Profile: Starting at 600mm, this unit is designed to be fine tuned for the most challenging under window or low ledge installations.
• Dual Option Flush Plate Mounting: Complete flexibility to install your flush plate on the front or the top of the cistern to suit your cabinetry.
• Optimized for Back-to-Wall Toilets: The perfect concealed partner for floor standing pans, creating a seamless look.
• Full Thermal & Acoustic Insulation: Insulated jacket eliminates the risk of condensation and ensures a premium, quiet operation.
• Adjustable Dual Flush: High performance water management that allows you to customize your environmental impact.
• Professional Specification: Features a 1/2" water inlet and is designed to operate reliably across a wide dynamic pressure range (0.1 – 10 bar).
• Front Access Servicing: Every internal component can be reached through the flush plate for easy maintenance.

About Roca: A Century of Design Excellence

Founded in Barcelona in 1917, Roca has evolved from a family-owned workshop into a global icon of the bathroom industry. With a presence in over 170 markets, Roca is driven by a philosophy that blends Mediterranean craftsmanship with industry leading innovation. Roca is dedicated to creating sustainable, emotionally resonant products that enhance homes worldwide.

Flush Plates available separately.