An adaptor for discriminating connection of an oral tip of a source of liquid enteral product to a feeding line. In one embodiment, the adaptor includes an internal stop in the body having a contact surface that is angled with respect to a transverse plane extending generally transverse to the longitudinal axis of the connection port so that if the standard luer tip is inserted into the connection port, the luer tip does not make flush contact with the contact surface. In another embodiment, the adaptor includes an external stop surrounding the connection port generally adjacent to the first open end of the body. The adaptor may include an umbrella valve. In other embodiments, the adaptor includes a fluid release opening in fluid communication with the connection port extending generally radially through the adaptor body at a location spaced from the longitudinal ends of the body.