Abstract: An on line water purifier comprising a top screwed to a bowl with a gasket an outlet port upper side of the said cap leading into the centre of inner side of the said cap leading into the inner side the said cap at side of said bush;a resin chamber having a pair of sleeves with external threads communicating inside of the said chamber having zigzag water flow path therein;one of the said nipple screwed to said the centre bush and other nipple screwed to a filter element,and said inlet and outlet ports connectable a water supply pipe and discharge device by means of tubing with nipples having matching external threads.