Inspection hole is a type of manhole that is used by technicians to inspect the internal pipes of suspended ceilings, such as central air conditioning ducts, electrical conduits, bathroom drainage pipes, etc., during the decoration process. The birth of finished product inspection ports has filled the gap in the domestic market and is widely used in government departments, airports, star rated hotels, guesthouses, office buildings, villas, shops and other household places. This product is easy to transport, easy to construct, not easy to damage, has fire prevention, environmental protection and other characteristics, and is deeply loved by users.