Viva Skylo Unifill Replacement Diaphragm Washer — UNI/SD
The Viva Sanitary UNI/SD is the official replacement diaphragm washer engineered specifically for the Skylo Unifill 4-in-1 range of toilet cistern inlet valves. If your toilet cistern is continuously passing water into the pan, trickling down the overflow, or filling exceedingly slowly, a worn or split diaphragm seal inside the head of the valve is almost always the cause. Fitting this authentic Viva replacement diaphragm restores a quick, watertight shut-off without having to disassemble the supply pipework or replace the entire inlet valve assembly.
Identification Guide:
Brand: Viva Sanitary | Range: Skylo Unifill | MPN: UNI/SD | FTB SKU: FTB5279 | Valve Compatibility: UNI/B (Brass Shank) & UNI/P (Plastic Shank) Only
Key Features
- Precise Original Fit: Manufactured to exact tolerances for Viva Skylo Unifill valve heads, eliminating passing water and whistling sounds.
- Durable Synthetic Rubber: High-grade, flexible rubber diaphragm combined with a rigid plastic central pin designed to resist hard water scaling and chloramines.
- Cost-Effective Repair: Reconditions the fill valve in minutes without draining the entire cistern or disturbing bottom/side inlet supply pipe connections.
- Quick Installation: Easily accessed by twisting off or unscrewing the upper valve cap assembly.
Compatibility & Installation Note
Strict Model Compatibility: This washer is manufactured exclusively for the Viva Skylo Unifill UNI/B (brass thread) and UNI/P (plastic thread) 4-in-1 inlet valves. It does not fit other Viva valves, generic Torbeck designs, or standard Siamp/Fluidmaster valves. Before fitting, turn off the water supply, remove the cap, inspect the plastic seating inside the valve body for limescale or debris, rinse clear, and insert the new diaphragm with the central pin correctly seated.