WC Cistern Parts & Accessories

Repairing a toilet cistern is easier when the replacement part is matched by function, entry position, connection and operating type. This collection brings together WC filling valves, flush valves, flush-and-fill component packs and replacement buttons for everyday cistern repairs, planned maintenance and new installations.

Choosing the correct cistern part

A filling valve controls how the cistern refills after flushing. Check whether the water supply enters through the bottom or side of the cistern, then confirm the inlet size and whether the connection is plastic or brass. Adjustable or telescopic models can help where cistern height and water level need to be set during installation. Delayed-action filling valves are a separate option and should be chosen only where that operating method suits the job.

A flush valve releases the stored water into the pan. Match the outlet size, flush type and button arrangement, and check the available cistern height. Single-flush, dual-flush, telescopic and cable-operated mechanisms are not automatically interchangeable, so use the individual product specifications and compatibility notes before ordering.

Packs, buttons and practical checks

Component packs combine compatible filling and flushing mechanisms, making them useful when both sides of an older cistern need attention. Replacement buttons are intended for the stated valve family and should not be selected by appearance alone. Before ordering, identify the existing mechanism where possible and measure the cistern, inlet position, connection and outlet.

Each listing shows the verified specifications available for that exact product, including relevant adjustment ranges, pressure information and approvals where manufacturer evidence has been supplied. GetPlumb supports trade and DIY customers with clear product information, next-day national delivery where available, and click and collect from Reading.