This product will fit to WC tank with 2 inch bottom outlet. Please check or measure the dimater of the hole in your Tank. Standard Size is 2 inch. Bottome hole on the tank is slighlty over 2 inch in diameter Suitable for Close Couple WC with Button hole on the top of the Cistern Lid Chrome Ring Underneath the Push Buttons not needed for CErmaic WC tank only for Back to wall Furniture cabinet. Also can be used in concenled WC tank behind the wall or inside the Wooden back to wall unit cabinet Button Diameter is 38mm Which most Holes on the Cistern LID in UK is standard 38mm. Measure the size of the home on the Lid for push button please This is an standard size good quality e WC flush. please make sure Bottom outlet and push button hole is the right size to fit yours 38mm Push buton hole adn 2 inch bottom outlet in the tank is standard size. Some toilets may differ in size please make sure you chose the right product Instruction Manual supplied. Any Question or problem Please e-mail or Call us. We will be happy to assist and advise you. If you haven't Fitted WC flush before, Its quite of a Task please Refer to the Experienced Plumber This product is Approved by CE, UPC,WRAS etc, Manufacturer: Housler