This Grohe 43808000 Adagio Replacement Pneumatic Single Flush Valve Diaphragm Seal is a essential component for your central heating system. It effectively stops leaks between pipework and components, preventing water and dangerous gases from escaping the system. This replacement syphon washer is compatible with a variety of Grohe Cisterns, including the Adagio 37905 SHO, 37945 SHO, 37762 SHO, 37906 SHO, 37907 SHO, 37911, 37912, 37913, 37909, and 37910 models.