An intravenous tube for use in an infusion set , the tube comprising: a flexible polymeric body defining a fluid flow pathway; a first tube end ; a second tube end ; a first tube marker disposed on the tube , wherein the first tube marker is positioned so that a distance (z1) between a leading edge of the first tube marker and an outermost surface of the first tube end is equal to a distance between an outermost surface of a fluid port of a first infusion set component and a hard stop of the fluid port , wherein the hard stop is configured to contact and block the outermost surface of the first tube end from further advancement into the fluid port of the first infusion set component , wherein the first tube marker comprises material that is only visible under an ultraviolet, UV, light spectrum, and wherein the first tube marker comprises multiple cylindrical bands disposed on the first tube end ; a second tube marker disposed on the tube , wherein the second tube marker is positioned so that a distance (z2) between a leading edge of the second tube marker and the outermost surface of the second tube end is substantially equal to a distance between an outermost surface of a second infusion set component fluid port and a hard stop of the second infusion set component fluid port , wherein the second tube marker comprises material that is only visible under a specific light spectrum, and wherein the second tube marker comprises a different number of cylindrical bands than the first tube marker ; and an informational marking disposed on the tube , wherein the informational marking comprises material that is only visible under a UV light spectrum. a flexible polymeric body defining a fluid flow pathway; a first tube end ; a second tube end ; a first tube marker disposed on the tube , wherein the first tube marker is positioned so that a distance (z1) between a leading edge of the first tube marker and an outermost surface of the first tube end is equal to a distance between an outermost surface of a fluid port of a first infusion set component and a hard stop of the fluid port , wherein the hard stop is configured to contact and block the outermost surface of the first tube end from further advancement into the fluid port of the first infusion set component , wherein the first tube marker comprises material that is only visible under an ultraviolet, UV, light spectrum, and wherein the first tube marker comprises multiple cylindrical bands disposed on the first tube end ; a second tube marker disposed on the tube , wherein the second tube marker is positioned so that a distance (z2) between a leading edge of the second tube marker and the outermost surface of the second tube end is substantially equal to a distance between an outermost surface of a second infusion set component fluid port and a hard stop of the second infusion set component fluid port , wherein the second tube marker comprises material that is only visible under a specific light spectrum, and wherein the second tube marker comprises a different number of cylindrical bands than the first tube marker ; and an informational marking disposed on the tube , wherein the informational marking comprises material that is only visible under a UV light spectrum. <EOS>