Roca Bathrooms Duplo 1 Underwindow Adjustable Cistern Tank, Concealed WC Cistern, Toilet Flush Tank Replacement, Height Adjustable

In stock
£156.18
Roca Bathrooms Duplo 1 Underwindow Adjustable Cistern Tank, Concealed WC Cistern, Toilet Flush Tank Replacement, Height Adjustable

Roca Bathrooms Duplo 1 Underwindow Adjustable Cistern Tank, Concealed WC Cistern, Toilet Flush Tank Replacement, Height Adjustable

SKU W-D41013
Manufacturer part number
A8900722A1
EAN
8445662060849
£156.18
inc VAT£130.15 ex VAT
Lead time: 1-5 working days
Price BeaterSeen this item cheaper elsewhere? Let us know.

Price Beater

Found this item cheaper elsewhere? Tell us where and our team will see if we can beat the price you've seen.

Product: Roca Bathrooms Duplo 1 Underwindow Adjustable Cistern Tank, Concealed WC Cistern, Toilet Flush Tank Replacement, Height Adjustable (Part no. W-D41013)

UK or international, for example 01234 567890 or +44 1234 567890

If you leave out https:// we add it for you.

Questions about this part? Talk to our team

Phone: 01226 369637

Opening times

Monday to Friday 08:00 to 17:00
Saturday and Sunday: closed

Delivery

Free standard delivery on orders over £100 ex VAT. Orders below this carry a £7.95 inc VAT delivery charge. Express delivery items £19.95 inc VAT, allow 1 to 2 working days. Delivery details and surcharges

Need delivery on or before a specific day? Ask our team.

Description

Product Overview

The Roca Bathrooms Duplo 1 underwindow adjustable cistern tank is a concealed WC cistern designed for installations where height is restricted, such as below a window. It provides a neat, space-saving flush solution behind a wall or furniture unit while allowing adjustable positioning for an easier fit. Ideal for replacement projects, it helps restore reliable flushing with a genuine, compatible component.

Key Features

  • Underwindow design – suitable for low-height installations where a standard concealed cistern may not fit.
  • Adjustable set-up – helps align the cistern during installation, making it easier to achieve a correct fit and finish.
  • Genuine Duplo 1 component – designed for compatibility within the Roca Duplo 1 system for dependable performance.
  • Replacement-ready – ideal for refurbishments and repairs to restore a concealed toilet flush tank without changing the full bathroom layout.
  • Space-saving concealed solution – keeps pipework and the flush tank hidden for a clean, modern bathroom look.

Use Case / Application

Designed for concealed WC installations in bathrooms, cloakrooms and ensuite toilets, especially where the cistern must sit below a window line or within limited vertical space. Suitable for domestic upgrades and professional plumbing work, including like-for-like replacement of an existing Duplo 1 cistern tank in a wall-hung or back-to-wall toilet set-up (system dependent).

Problem → Solution

Perfect for underwindow bathroom layouts where a standard concealed cistern is too tall, providing an adjustable, space-efficient solution that helps achieve a reliable flush and a tidy finish.

Product Specifications

  • Manufacturer – Roca Bathrooms
  • Manufacturer Part Number (MPN) – A8900722A1
  • Manufacturer Range / Series – Duplo 1
  • EAN / Barcode – 8445662060849
  • Product Type – Concealed WC cistern tank (underwindow, adjustable)
  • Typical Applications / Use Cases – Underwindow concealed toilet installations, bathroom and cloakroom refurbishments, Duplo 1 cistern replacement

Why Buy from BHL

Roca Bathrooms is a leading bathroom manufacturer known for reliable, well-engineered concealed cistern systems. Choose the Roca Bathrooms Duplo 1 underwindow adjustable cistern tank (A8900722A1) for a compatible replacement that supports a neat, modern installation. Buy online from BHL for competitive pricing, genuine parts and free* & fast UK delivery. BHL is a specialist online merchant trusted by thousands of satisfied customers since 1998, with thousands of 5 star reviews, and orders are delivered with care from UK warehouses. *see our terms

Reviews

Buying guide: Toilet Cisterns & Pans

This category covers the main parts of a toilet: close coupled, back to wall and wall-hung pans, close coupled and concealed cisterns, and the flush valves, fill valves, flush plates, pan connectors and fixing kits that go with them.

Pan and cistern styles

  • Close coupled: the cistern sits directly on the back of the pan to form one suite.
  • Back to wall: the pan sits tight against the wall, with the cistern concealed in furniture or a boxed-in duct.
  • Wall-hung: the pan is carried on a frame built into the wall, with a concealed cistern worked by a flush plate.
  • Raised height: taller pans, often chosen for accessible bathrooms.

Matching parts

Pans and cisterns are usually designed in pairs, so check that a replacement is listed as compatible with the other half. Note whether the cistern is fed from the bottom or the side, and whether the overflow is internal, into the pan, or external. Pan connectors join the pan outlet to the soil pipe and come straight, offset and angled to suit the pipe position. For replacement flush and fill valves, match the cistern's outlet size and flush type, single or dual.

Standards and regulations

In England and Wales, under the Water Supply (Water Fittings) Regulations 1999, a single WC flush must not exceed 6 litres, and every WC cistern inlet needs a servicing valve next to the cistern. Dual flush cisterns of 6/4 and 4/2.6 litres are common. Pans with an integral trap, and close coupled suites, are covered by BS EN 997, and separate flushing cisterns by BS EN 14055.

For toilet seats, see toilet seats, or browse complete toilets.

Shop all Toilet Cisterns & Pans

Related products

Customers also bought