For more detail, see Plumb2U.

Before ordering, it helps to note the frame's brand if it is visible on the tank or access panel, along with the fill valve and flush valve dimensions if the old parts can be measured before removal. Plumb2U stocks fill valves, flush valves, cables, spindles and flush plates suited to the concealed cisterns most commonly found in UK homes, at trade prices, which helps when a plumber is working blind on a job where the tank itself cannot be seen until the access plate is off. With next-day despatch available on the common models, Plumb2U's stock list is worth checking against the frame details before committing to a specific part.

Where brand-specific parts genuinely earn their keep is on cisterns built to a proprietary design that a universal part simply cannot replicate. Concealed cistern frames are the clearest example, since the tank dimensions, fill valve fitting and flush plate connection are often specified by the frame manufacturer and will not accept a generic part regardless of how adjustable it claims to be. Some premium close-coupled suites also use proprietary flush valve shapes or seal profiles that a standard universal valve will not seat against correctly, leading to a slow leak that only appears once the cistern is refilled and left running for a while.

For more detail, see flexible hose supplier.

A cistern that whistles, knocks or hammers while filling is one of the more annoying faults a customer will report, and it is also one of the quicker ones to run down with a short checklist before a plumber even gets to the van. Two causes account for the large majority of noisy-cistern callouts: a worn fill valve and excessive mains pressure, and telling them apart early saves time on site.

Plumb2U stocks side levers, lid-mounted levers and the link arms and clips that connect them to flush valves and siphons, priced for trade buyers ordering more than one at a time. For a plumber working through several lever jobs a week, having a trade supplies merchant that lists the fitting details clearly rather than a single generic photo makes the difference between one van visit and two. Plumb2U, trading from Epsom but supplying trade accounts UK-wide, carries a lever range that covers most of what turns up on a round.

When a full lever replacement is needed, the fitting type has to match what is already there. Side levers, which mount through a hole in the side of the cistern, come in different thread diameters and in both metal and plastic bodies, and the arm length inside the tank needs to reach the flush valve or siphon without fouling the tank wall. Levers that mount through the lid, more common on close-coupled and concealed designs, connect via a spindle rather than a side arm and are not interchangeable with side-lever fittings.