Water trap

A water trap comprising:

• a. a substantially cylindrical outer casing having a flat top wall, a side wall and a frustoconical bottom wall, and
• b. an internal substantially semi-circular open topped water seal container within the outer casing which occupies a half segment of the outer casing thus defining a second half segment region, the water seal container having a flat base and a top edge which terminates below the top wall of the outer casing defining a space between the top edge and the flat top wall of the casing,
• c. an inlet into the water seal container which passes through the flat top wall of the casing, abutting a side wall of the water seal container and terminating in close proximity to the flat base of the water seal container, the cross-sectional area of the inlet being constant over its length,
• d. an outlet from the frustoconical bottom wall of the outer casing which is offset and co-linear with the inlet,
• e. the inlet having a sink connecting nut and the outlet having an external O-ring seal,
• f. the invention characterized in that the cross-sectional areas of the inlet, water seal container excluding the inlet, the space above the top edge of the water seal container, and the region between the water seal container and the outer casing, progressively increase to assist water flow through the trap.