Patent ID: 8251101

Claim:
A refrigerant piping unit comprising: a pipe having a substantially L-shape including a main section, an end section and a bent section between the main section and the end section, the bent section providing a rounded corner having a smooth rounded inner surface; and a joint coupled to the pipe, the joint constituting a coupling member for coupling the pipe to another member, wherein the end section of the pipe includes a flange portion adjacent to the bent section and a thick end portion opposite to the bent section with respect to the flange portion in an axial direction, the flange portion is expanded in a radially outward direction and is engaged with the joint, the thick end portion is expanded in the radially outward direction and has a thickness greater than a thickness of the main section, the thick end portion has a groove on its outer surface for receiving an O-ring, the end section has a flat inner surface extending continuously and smoothly from the smooth rounded inner surface of the bent section throughout an inside of the flange portion and the thick end portion; at least a part of the bent section is disposed inside of the joint, and the flat inner surface of the end section extends from a position inside of the joint to a position outside of the joint.