WC Filling Valves

Shop replacement WC filling valves for repairing noisy, slow-filling or continuously running toilet cisterns. Also called toilet inlet valves or cistern fill valves, these mechanisms control the incoming water supply and shut it off automatically when the cistern reaches the selected water level.

Choose from side-entry and bottom-entry filling valves with plastic or brass inlet tails, adjustable water levels and compact or telescopic bodies for different cistern layouts. Before ordering, check where the supply pipe enters the cistern, the inlet connection size, the available internal height and whether the existing installation uses a plastic or brass threaded tail. A valve that looks similar may still have a different connection or adjustment range.

Modern hydraulic filling valves can provide quieter operation than traditional float-arm mechanisms while using less space inside the cistern. Depending on the model, features may include anti-backflow protection, delayed action, serviceable filters, low-pressure compatibility and WRAS or NF approval. Product-specific certifications and performance details are stated only where supported by the manufacturer.

A filling-valve fault commonly causes slow refilling, excessive noise, failure to shut off or water running into the overflow. Continuous water entering the toilet pan can also be caused by the flush-valve seal, so inspect both mechanisms before replacing parts. GetPlumb supplies WC cistern components for plumbers, maintenance professionals and household repairs. Compare the dimensions and specifications shown on each listing, and contact us with clear photographs of the existing valve, its inlet position and any visible manufacturer markings if you need help finding a compatible replacement.