Porthole to be mounted on a wall of an above ground pool/storage container, without cover, for liquids, granulates or powders

摘要

The porthole has a transparent circular glass (3) placed inside a swimming pool/tank, where the glass has flat or bulged surface. The glass has small holes for fixation screws, where each hole permits to insert the entire head of each screw within the surface. A plastic frame (4) having outer diameter same as that of the glass is placed at outside of the pool/tank. The frame is retained by anchoring the screws within the frame. Rubber liners (5) with outer diameter equal to that of the glass is placed, on the inner and outer of the pool/tank, between the glass and the frame.