A fluid swivel, comprising: a center joint configured to allow rotation about a center-joint axis, comprising: a first port having a first-port axis that is perpendicular to the center joint axis; a second port having a second-port axis that is perpendicular to the center joint axis; a third port in communication with the first port, the third port having a third-port axis that is parallel to the center joint axis; and a fourth port in communication with the second port, the fourth port having a fourth-port axis that is parallel to the center joint axis; a first-end joint configured to allow rotation about a first-end-joint axis, the first-end joint comprising: a first passage having an entrance and an exit that are perpendicular to each other; and a second passage having an entrance and an exit that are perpendicular to each other; a second-end joint configured to allow rotation about a second-end-joint axis, the second-end joint comprising: a first duct having an entrance and an exit that are perpendicular to each other; and a second duct having an entrance and an exit that are perpendicular to each other; a first tube coupled between the first passage of the first-end joint and the first port of the center joint; a second tube coupled between the second passage of the first-end joint and the second port of the center joint (206, 310); a third tube coupled between the first duct of the second-end joint and the third port of the center joint; and a fourth tube coupled between the second duct of the second-end joint and the fourth port of the center joint; wherein the first-port axis and the second-port axis lie in a first plane that is perpendicular to the center joint axis; wherein the first duct of the second-end joint is configured to be coupled to a first line and the second duct of the second-end joint is configured to be coupled to a second line; and a first support member coupled between the first-end joint and the center joint, the first support member permitting relative movement between the first-end joint and the center joint transverse to the first plane and preventing relative translation between the first-end joint and the center joint parallel to the first plane, wherein the third tube and the fourth tube are defined by a rigid unitary member configured to rotate relative to the center joint about the center joint axis and relative to the second-end joint about the second-end-joint axis. a center joint configured to allow rotation about a center-joint axis, comprising: a first port having a first-port axis that is perpendicular to the center joint axis; a second port having a second-port axis that is perpendicular to the center joint axis; a third port in communication with the first port, the third port having a third-port axis that is parallel to the center joint axis; and a fourth port in communication with the second port, the fourth port having a fourth-port axis that is parallel to the center joint axis; a first port having a first-port axis that is perpendicular to the center joint axis; a second port having a second-port axis that is perpendicular to the center joint axis; a third port in communication with the first port, the third port having a third-port axis that is parallel to the center joint axis; and a fourth port in communication with the second port, the fourth port having a fourth-port axis that is parallel to the center joint axis; a first-end joint configured to allow rotation about a first-end-joint axis, the first-end joint comprising: a first passage having an entrance and an exit that are perpendicular to each other; and a second passage having an entrance and an exit that are perpendicular to each other; a first passage having an entrance and an exit that are perpendicular to each other; and a second passage having an entrance and an exit that are perpendicular to each other; a second-end joint configured to allow rotation about a second-end-joint axis, the second-end joint comprising: a first duct having an entrance and an exit that are perpendicular to each other; and a second duct having an entrance and an exit that are perpendicular to each other; a first duct having an entrance and an exit that are perpendicular to each other; and a second duct having an entrance and an exit that are perpendicular to each other; a first tube coupled between the first passage of the first-end joint and the first port of the center joint; a second tube coupled between the second passage of the first-end joint and the second port of the center joint (206, 310); a third tube coupled between the first duct of the second-end joint and the third port of the center joint; and a fourth tube coupled between the second duct of the second-end joint and the fourth port of the center joint; wherein the first-port axis and the second-port axis lie in a first plane that is perpendicular to the center joint axis; wherein the first duct of the second-end joint is configured to be coupled to a first line and the second duct of the second-end joint is configured to be coupled to a second line; and a first support member coupled between the first-end joint and the center joint, the first support member permitting relative movement between the first-end joint and the center joint transverse to the first plane and preventing relative translation between the first-end joint and the center joint parallel to the first plane, wherein the third tube and the fourth tube are defined by a rigid unitary member configured to rotate relative to the center joint about the center joint axis and relative to the second-end joint about the second-end-joint axis.