Thomas Dudley Ltd S7 Cascade Siphon 229mm (8121F)

Thank you for your enquiry, We would like to know some more information if possible. Could you tell me what type of cistern the Syphon was fitted into, or how this was tested ? The Internal overflow is designed to allow excess water, once it reaches the “ Spill Over Point of the Syphon “ to overflow into the down leg, and then into the Toilet Pan. ( Normally this is caused by a failure of the diaphragm washer of the inlet valve, allowing a small amount of water to gradually fill the cistern with water ) The internal Overflow is not designed to take a Full Bore failure of the inlet valve. i.e the Rapid filling of the cistern with water I trust that this helps, but if you need any more information, please give our team a call on 0121 530 7000 Kindest Regards Thomas Dudley Sales Team

Good Morning, you will need to check your water level in the cistern first, if you have an 8" waterline then a 9" syphon will be fine to fit into the cistern. It is important to keep a 1" gap from the water level and the internal overflow height. All our Syphon measurements are to the internal overflow height, not the overall height of the syphon. Kind Regards, The Sales Team

Sorry, its sorted. Should have worked out yellow flap arrangment before I installed it. I was just removing and installing flap without realising you had to position it over the triangular hole!!