Patent ID: 6874822

Claim:
A resinous tube having opposite ends into one of which a mating member is fitted and with which the mating member is connected, the resinous tube comprising: a sealing ring being disposed on an inner peripheral surface of the opposite end, and contacting elastically with an outer peripheral surface of the mating member; a fastening cap being disposed on the inner peripheral surface of the opposite end and exterior to the sealing ring, and having an inner peripheral surface around which a projection part is formed in a ring like manner, the projection part contacting elastically with the outer peripheral surface of the mating member; a clamp being disposed on an outer peripheral surface of the opposite end, the opposite end being provided with the fastening cap on the inner peripheral surface, wherein said clamp acts to tighten said fastening cap and to thereby fasten said mating member; and a ring disposed within said resinous tube and interior to said sealing ring, wherein the opposite end is formed of a thickness sufficiently thin so as to be capable of diametrically enlarging, and said sealing ring and said ring are brought into contact with the inner peripheral surface of the opposite end elastically by the diametrically enlarged opposite end, said projection part is not pressed onto and not brought into contact with said mating member when the mating member is fitted into said opposite end, and said projection part is pressed onto and brought into contact with said mating member by tightening up said fastening cap with said clamp after the mating member is fitted into said opposite end.