PURPOSE:To enhance positioning size accuracy and the whole rigidity as well as to improve the extent of quality by producing an interconnecting pipe with such piping as larger than a barrel part of a socket, while having this socket seated in a hole installed after piercing through an opposed surface, and forming it as one body by means of brazing or welding the circumference. CONSTITUTION:An interconnecting pipe 22 is produced with piping with a maximum diameter part large than an outer diameter of each barrel part of sockets 21A-21D, while a receiving hole of each peripheral part of these sockets 21A-21D is installed an each opposed surface of the piping so as to be pierced through, and the whole is formed as one body by means of brazing or welding the circumference in a state of having these sockets 21A-21D seated in this hole. Since the interconnecting pipe 22 is produced in a body with the broad piping like this, rigidity is high enough, and any possible heat deformation at time of welding is prevented from occurring. In addition, as the interconnecting pipe 22 has the largest diametral part, the hole is accurately machibable at a specified pitch, through which these sockets 21A-21D are brazed or welded in a state of being seated of being seated, thus a mounting pitch and an angle among these sockets themselves can be held up.
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