Cover flap for tubing inner side with inner hinge, has internal screw connection and is made up of steel, aluminum, high-grade steel, cast iron, ceramics or plastic

摘要

The cover flap has internal screw connection and is made up of steel, aluminum, high-grade steel, cast iron, ceramics or plastic. The cover has opened outer ring in lower area and with half side opening of the inner ring. The filling of the inner ring is made up of an impermeable material for animals.