DUST-PREVENTING PROTECTIVE CAP FOR NARROW AND THICK PIPE

摘要

PROBLEM TO BE SOLVED: To provide a dust-preventing protective cap capable of ensuring the internal cleanliness of a narrow and thick pipe having a connecting head part and protecting a seat surface in transportation. SOLUTION: This dust-preventing protective cap for the connecting head of the narrow and thick pipe having the connecting head part the circumferential surface of which is a truncated conical or truncated circular seat surface to a counter seat part is formed of a plug body fitted into the pipe of the connecting head part, and a connecting head part covering cap body attachable to and detachable from the plug body.