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"Slip Ball" is a device fitted into the floor and gully trap to effectively prevent cockroaches and other insects from entering and breeding.
It consists of a light-weight ball which rests at bottom of the device over an opening. When water flows into the floor/gully trap, the "Slip Ball" floats allowing water to flow through. When no water flows, the "Slip Ball" rests at the bottom of the device, thus preventing foul smell, insect breeding at the water seal.