SONAS Concealed Cistern for Back-to-Wall WC Units

The reliable heart of your modern bathroom. The SONAS Concealed Cistern is the professional choice for creating a sleek, minimalist look in any bathroom or cloakroom. Specifically designed for use with back-to-wall toilet pans and furniture units, this cistern is hidden from view, leaving only your choice of stylish flush plate visible. Its universal design makes it compatible with a wide range of furniture brands and stud-wall installations.

Flexibility is built-in. The cistern features a dual-flush valve that is easily adjustable between 6/4L or 3/6L, helping you save water without compromising on performance. Uniquely designed for both front and top operation, it can be installed in a variety of heights and furniture depths. Built from high-density, impact-resistant plastic, this unit is engineered for quiet filling and long-term leak-free operation.

Key Features

• Universal Compatibility: Designed to work perfectly with all standard Back-to-Wall WC pans.

• Flexible Operation: Suitable for both front and top-mounted flush plate installations.

• Dual Flush Technology: Adjustable 3/6L flush valve to optimize water efficiency.

• Compact Slimline Design: Ideal for installations within bathroom furniture or narrow stud walls.

• Quiet-Fill Valve: Engineered to minimize noise during the refill cycle.

Technical Specs

• Width: 582mm

• Height: 510mm

• Depth: 145mm - 200mm (Adjustable)

• Flush Volume: 6/4L (Adjustable to 3/6L)

• Inlet Position: Side entry

• Guarantee: 2 Years

Norbreck Expert/Design Tip

"The Unit Essential" — If you’re buying a back-to-wall furniture unit, this is the cistern you need. Expert Tip: The fact that this cistern can be accessed from either the top or the front is a lifesaver for maintenance. Always ensure your installer leaves the top lid of your furniture unit removable!