A compact 9" toilet flush syphon from Fluidmaster with dual flush function for easier control over water consumption. This flush valve is compatible with most lever-operated cisterns. Fluidmaster Compact Syphon 9" in Black. Fluidmaster 9 inch compact syphon suitable for virtually all 1 1/2" lever operated cisterns. Dual flush for water saving benefits, with adjustable volumes for both full and partial flushes. Delivers a consistent, leak-free flush with minimal maintenance needs.