Genuine Siamp Diaphragm Washer for Inlet Flush Valves There's no need to replace a whole cistern inlet float valve just because you need a new diaphragm washer, just simply purchase this inexpensive but high quality and genuine Siamp diaphragm washer to replace the old one, and job done!! Siamp is unanimously considered to be a worldwide leader in innovation and modern technical solutions in the sanitary market. Every product designed and manufactured by Siamp encompasses their main principles of efficiency, viability and sustainability. This genuine specially designed Siamp diaphragm washer, 28mm, is a frequently required replacement part for the 99T and 99B inlet flush valves: - Siamp 99T Inlet Valve 1/2" Plastic - Siamp 99B Inlet Valve 1/2" Brass YouTube Video will.