A riser segment assembly (22, 22a)comprising: - a main tube defining a primary lumen; - a collar (140, 140a) defining a first lateral opening in fluid communication with the primary lumen; - two flanges (112a, 112b, 112c, 112d) each coupled to a different end of the main tube, each flange comprising: ∘ a mating face configured to mate with a flange of an adjacent riser segment; and ∘ a central flange lumen configured to be in fluid communication with the primary lumen of the main tube; - a first valve coupled to the first lateral opening, the first valve having a longitudinal flow axis that is more parallel than perpendicular to a longitudinal axis of the main tube; - a first fitting (164, 164a) coupled to the collar (140, 140a) over the first lateral opening and configured to be removably coupled to the first valve, the first fitting (164, 164a) defining a first fitting lumen in fluid communication with the first lateral opening; characterized in that the assembly (22, 22a) further comprises: - a first connector, o secured to the first fitting and to a first end of the first valve, a second connector, being secured to a second end of the first valve and having a protrusion,, and a third connector, being configured to be coupled to the main tube and defining a first recess configured to slidably receive the protrusion of the second connector to provide a sealed connection between the second connector and the third connector without threading or welding or ∘ having a protrusion configured to be inserted into a recess of the first fitting, and the first valve is disposed between the first connector and a second connector configured to be coupled to the main tube, wherein the recess of the first fitting is configured to receive the protrusion without threading or welding to permit fluid communication between the first fitting lumen and the first valve. - a main tube defining a primary lumen; - a collar (140, 140a) defining a first lateral opening in fluid communication with the primary lumen; - two flanges (112a, 112b, 112c, 112d) each coupled to a different end of the main tube, each flange comprising: ∘ a mating face configured to mate with a flange of an adjacent riser segment; and ∘ a central flange lumen configured to be in fluid communication with the primary lumen of the main tube; ∘ a mating face configured to mate with a flange of an adjacent riser segment; and ∘ a central flange lumen configured to be in fluid communication with the primary lumen of the main tube; - a first valve coupled to the first lateral opening, the first valve having a longitudinal flow axis that is more parallel than perpendicular to a longitudinal axis of the main tube; - a first fitting (164, 164a) coupled to the collar (140, 140a) over the first lateral opening and configured to be removably coupled to the first valve, the first fitting (164, 164a) defining a first fitting lumen in fluid communication with the first lateral opening; - a first connector, o secured to the first fitting and to a first end of the first valve, a second connector, being secured to a second end of the first valve and having a protrusion,, and a third connector, being configured to be coupled to the main tube and defining a first recess configured to slidably receive the protrusion of the second connector to provide a sealed connection between the second connector and the third connector without threading or welding or ∘ having a protrusion configured to be inserted into a recess of the first fitting, and the first valve is disposed between the first connector and a second connector configured to be coupled to the main tube, wherein the recess of the first fitting is configured to receive the protrusion without threading or welding to permit fluid communication between the first fitting lumen and the first valve. o secured to the first fitting and to a first end of the first valve, a second connector, being secured to a second end of the first valve and having a protrusion,, and a third connector, being configured to be coupled to the main tube and defining a first recess configured to slidably receive the protrusion of the second connector to provide a sealed connection between the second connector and the third connector without threading or welding or ∘ having a protrusion configured to be inserted into a recess of the first fitting, and the first valve is disposed between the first connector and a second connector configured to be coupled to the main tube, wherein the recess of the first fitting is configured to receive the protrusion without threading or welding to permit fluid communication between the first fitting lumen and the first valve.