Seawhisper 28 Spline Ceramic Tap Cartridge Valve Replacement 1/4 Turn 53mm — Anti-Clockwise, 1/2 BSP, SP3561 Compatible, Brass Body — Measure Before Buy

BEFORE YOU BUY — MEASURE YOUR ORIGINAL CARTRIDGE Replacement ceramic disc tap cartridge with 28 splines, 1/4 turn (quarter-turn) operation, 53mm overall height, and 1/2 inch BSP thread base. The spline shoulder diameter and thread length must match your existing cartridge — please remove and measure your original part before purchase to avoid NOT-COMPATIBLE returns. See product images for measurement diagram.

FITS 28-SPLINE 1/4-TURN CARTRIDGE INTERFACES Designed to fit common 28-spline quarter-turn tap cartridge interfaces marked SP3561 (also seen on parts coded 3547R, 2552R, S1022, F1427R). Used by homeowners and plumbers to replace dripping ceramic disc cartridges in kitchen mixer taps, bathroom basin taps, and bath-tub fillers. Does NOT fit 20-spline cartridges, push-fit cartridges, or compression valve taps — please verify spline count first.

BRASS BODY + CERAMIC DISC PLATES Solid brass cartridge body resists corrosion; precision-lapped ceramic disc plates deliver smooth quarter-turn flow control and tight shut-off.

HOT-COLD VALVE PAIR – RED + BLUEThis listing offers both matched hot-and-cold cartridge sets (red for clockwise opening, blue for counterclockwise opening; replacing both sides of your kitchen mixer delivers balanced water flow and consistent lever resistance) and individual single cartridges, please verify the opening rotation direction of your original valve before purchasing a single unit for proper matching.

EASY INSTALLInstall steps: (1) turn off mains water, (2) drain residual water from tap, (3) unscrew tap handle with Allen key, (4) unscrew old cartridge by spanner, (5) fit new cartridge hand-tight then ¼ turn with spanner, (6) refit handle. Estimated DIY time: 10 min per tap.