ALL IN HUBB CONCEALED CISTERN FLUSH TANK SYPHON SUITABLE FOR JAQUAR / SIAMP OLD MODEL Flush Tank Lever

It seems like you're describing a component of a toilet system. A white PVC concealed cistern is a water tank that is designed to be concealed within a wall or cabinetry, rather than being exposed. This type of cistern is commonly used in modern bathrooms for aesthetic reasons. Jaquar is a well-known brand in the bathroom fittings industry, so a "Jaquar siphon" likely refers to a siphon mechanism manufactured by Jaquar that is used within the concealed cistern to flush the toilet. The siphon is responsible for initiating and controlling the flushing process by releasing water from the cistern into the toilet bowl. If you're looking for specific information or assistance regarding a white PVC concealed cistern with a Jaquar siphon, you may need to consult the product's documentation or contact the manufacturer for support.