Abstract: The invention relates to an improved remotely operated plug assembly (13) of the type with a pop-up plug (13) and cabling (14), wherein the inter-engaging means and the means for retaining the plug (13) in the sink waste unit (11) and in the closed position are circumferential. This allows the free movement of fluid from the plug (13) to the sink waste unit (11). The improvement relates to the use of common elements for both the inter-engaging means and the retaining means so that the one movable pin (34) acts in both the inter-engagement of the plug (13) and the sink waste unit (11), and the retention of the plug (13) within the sink waste unit (11) and in the closed position.

Abstract: A remotely operated plug unit (13) for use in a sink or basin (12) with a sink waste unit (11). The drain pipe requires minor modification, by the insertion of two holes (18, 19) opposite one another part way down the threaded sides (17). The plug (13) is spring biassed to an open position and retained in a closed position by two pins (31, 34). The second pin 34 is remotely activated (by cabling (14)) by an actuator (44) and opening mechanism (15). The plug (13) is closed manually by direct downward pressure on the top of the plug (13). All components for operation of the plug (13) which are contained within the sink waste unit (11) are circumferentially positioned. Three preferred embodiments of the opening mechanism (15) are disclosed (two being capable of incorporation in a tap for the sink (12)). Various embodiments in the manner of operation of the plug (13) are also disclosed.

Abstract: A plug assembly (2) which can be used in a drain, sink or bath (5). The plug (2) is of the pop up type being spring biassed into an open position. The plug (2) includes inter-engaging means for engagement of the plug (2) with a waste pipe (3) and means to permit the movement of the plug (2) relative to the pipe (3), both of which are circumferentially situated so that there is no impediment to fluid moving through the plug (2) and into the pipe (3). The means to bias the plug (2) to the open position includes a spring (18) which is arranged between the exterior of the plug (2) side and the interior of the waste pipe (3), and shoulders (6, 19) formed in each, such that said fluid flowing through the pipe (3) does not contact the spring (18). The plug (2) can be manually operated or operated remotely.