To prevent excessive deformation from being exerted in a piping by providing a header single body formed of a metallic T-tube where one end and the other end of a straight tube part form an insert and a socket and a tube connection part is formed on one middle side, and attaching adjacent header single bodies to each other in a watertight and rotatable manner through a locking ring or a packing.
In a rotatable header single body S, an insert and a socket 1a, 1b are provided on one end and the other end of a straight tube part 1 of a corrosion protective metallic T-tube, a tube connection 1c is projected in a middle part, and fitting groove 2, 2' of the locking ring 2a and a recessed groove 3 of a strip of packing 3a are provided in an annular manner on an outer circumferential surface of the insert 1a across the outer and inner circumferential surfaces of the insert 1a and the socket 1b of the adjacent single bodies S which are fitted to each other. A plurality of header single bodies S are prepared, the inserts 1a of the required number are successively fitted to the sockets 1b, the locking ring 2a is elastically fitted to the fitting grooves 2, 2' of the ring to be formed in the fitting part, and the packing 3a is fitted to the fitting recessed groove 3 on each insert 1a side and connected in a watertight and rotatable manner to each other.
KOBAYASHI ISAMU
YONEDA CHIKAKO
