SELF-SEALING TYPE DOUBLE PIPE COUPLER AND PIPING SYSTEM FOR AIR CONDITIONER OR THE LIKE USING THE SAMEPROBLEM TO BE SOLVED: To set an interior machinery, an exterior machinery and a piping by preventing intrusion of air into the piping at the time of installing and remov ing the interior ...
SELF-SEALING TYPE DOUBLE PIPE COUPLER AND PIPING SYSTEM FOR AIR CONDITIONER OR THE LIKE USING THE SAMEPROBLEM TO BE SOLVED: To set an interior machinery, an exterior machinery and a piping by preventing intrusion of air into the piping at the time of installing and remov ing the interior ...