Connector member for connecting pipe line blocks and method for manufacturing the same

A method for manufacturing a connector member for connecting pipe line blocks, comprising:

• forming a connector member including a hollow pipe-shaped portion by injection molding of a synthetic resin;
• preparing an O-ring, wherein
• the pipe-shaped portion has a ring-shaped seal groove on an outer peripheral surface of the pipe-shaped portion, and an inclined surface having a conical surface shape on a side close to a pipe end from the seal groove on the outer peripheral surface, a diameter of the inclined surface being reduced toward the pipe end;
• adjusting a posture of the O-ring by bringing an inner peripheral surface of the O-ring into contact with the inclined surface such that the O-ring is orthogonal to a center axis of the pipe-shaped portion;
• and
• pushing the O-ring toward the seal groove while the posture is maintained, moving the O-ring to the seal groove while a diameter of the O-ring is increased, and attaching the O-ring to the seal groove.