Watertight testing device for a pipe joint part
S Kishi, Y Komaru, K Kamachi… - US Patent 12,000,755, 2024 - Google Patents
A watertight testing device includes a cylindrical core fit into a pipe joint part, a first seal
member for sealing between the outer surface of the core and the inner surface of one pipe …
member for sealing between the outer surface of the core and the inner surface of one pipe …