This Pro Ultra syphon from Fluidmaster is designed for virtually all 1 1/2" lever-operated cisterns, offering easy installation and maintenance with removable parts. Its unique dual flush system allows for adjustable full and partial flush volumes, giving you control over water usage. With rapid height adjustment, it fits cisterns with heights from 7.5" to 9.5" (190mm to 240mm). It is WRAS approved and comes with a 10-year manufacturer guarantee.