Easytap TZ2052CON quarter turn Dorf Kytin twin lever basin & kitchen mixer tap spindles contra rotating ceramic disc cartridge splined top. Contra rotating ceramic disc spindles are most commonly used with lever style taps with hot & cold water turning on or off in opposite directions. Correctly identifying the brand of taps will ensure the Easytap replacement spindle fits properly with original tap body, handles and flanges. A: If you know the tap brand (such as Dorf, Irwell, Donson etc) then simply match the same model from the Easytap range. B: If unsure as to the brand of the original tap, remove existing spindle, measure dimensions and match spindle from the range. 2 year manufacture warranty applies to Easytap ceramic disc cartridges (excludes labour). Warranty void if mechanical damage, such as over forced turning, incorrect or unlicensed installation