Remove pop-up disc and piston.
Position the Four-in-One™ Top Flange over the hole ensuring that a seal is achieved between the flange and basin (using the washer supplied, and/or a gasket of neutral cure silicon).
Re-assemble waste using thick washer to seal between body and underside of basin, and tighten the centre screw (do not overtighten).
Re-attach the piston and pop-up disc.
Must be installed by a qualified tradesperson in accordance with relevant standards.
Clean using warm soapy water and a soft cloth only.