A plastic body is configured as a tubular-shaped hollow body in a mid region thereof. The tubular-shaped hollow body is closed off by respective solid bodies at first and second ends. A displacement body, which is arranged at the transition from the hollow body to the first solid body, is arranged at the first end of the tubular-shaped hollow body. A hollow space, which extends between the tubular-shaped hollow body and the second solid body, is formed at the second end of the hollow body. For a production system for making an at least partially tubular-shaped plastic body in an injection molding process, the cavity has an elongated configuration with a first end and a second end and an injector nozzle is arranged between the ends of the cavity.