Easytap TZ2033CON quarter turn Dorf Venus twin lever basin & kitchen mixer tap spindles contra rotating ceramic disc cartridge, short seat body with 20 teeth 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. HOT clockwise close and COLD anti clockwise close. 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