WRAS Approved 6/7/9 flush volume selector Macdee one piece DSY0225 8 inch syphon Supplied with siphon back nut, flush pipe coupling nut, siphon seal and low level flush pipe seal 1.1/2" outlet For internal overflow measure from base of cistern to waterline and add 1", ensure that this measurement is a minimum of 10mm below any aperture in the cistern