A catheter hub apparatus comprising: a. a distal hub member comprising i. a longitudinal lumen, ii. a proximal hub attachment member comprising a proximally-extending arm and a resilient projection, and iii. a body member; b. a proximal hub member comprising i. an outer wall defining an internal cavity and having an open distal end, ii. a central mounting section comprising a distally-extending annular wall defining a longitudinal lumen, an annular shelf, and an opening at a proximal end of the proximal hub member, and iii. a catch formed in the outer wall of the proximal hub member; c. a core member comprising i. a wall defining a longitudinal lumen, ii. a flange at a proximal end of the core member, iii. an annular detent, and iv. an annular recess; and characterized in that it further comprises: d. a sealing member attached to an inside surface of the body member of the distal hub member comprising a wall defining a longitudinal lumen, the longitudinal lumen having a diameter greater than an outside diameter of the core member; e. a hemostasis valve interfacing with the inside surface of the body member of the distal hub member; and f. an o-ring seated within the annular recess of the core member; g. wherein the resilient projection is configured to engage with the catch to couple removably the distal hub member and the proximal hub member, the hemostasis valve forms a fluid barrier preventing proximal fluid flow between a distal end of the longitudinal lumen of the distal hub member and a distal end of the sealing member, and the o-ring forms a fluid barrier between the distal end of the longitudinal lumen of the sealing member and the internal cavity of the proximal hub member. a. a distal hub member comprising i. a longitudinal lumen, ii. a proximal hub attachment member comprising a proximally-extending arm and a resilient projection, and iii. a body member; i. a longitudinal lumen, ii. a proximal hub attachment member comprising a proximally-extending arm and a resilient projection, and iii. a body member; b. a proximal hub member comprising i. an outer wall defining an internal cavity and having an open distal end, ii. a central mounting section comprising a distally-extending annular wall defining a longitudinal lumen, an annular shelf, and an opening at a proximal end of the proximal hub member, and iii. a catch formed in the outer wall of the proximal hub member; i. an outer wall defining an internal cavity and having an open distal end, ii. a central mounting section comprising a distally-extending annular wall defining a longitudinal lumen, an annular shelf, and an opening at a proximal end of the proximal hub member, and iii. a catch formed in the outer wall of the proximal hub member; c. a core member comprising i. a wall defining a longitudinal lumen, ii. a flange at a proximal end of the core member, iii. an annular detent, and iv. an annular recess; and characterized in that it further comprises: i. a wall defining a longitudinal lumen, ii. a flange at a proximal end of the core member, iii. an annular detent, and iv. an annular recess; and characterized in that it further comprises: d. a sealing member attached to an inside surface of the body member of the distal hub member comprising a wall defining a longitudinal lumen, the longitudinal lumen having a diameter greater than an outside diameter of the core member; e. a hemostasis valve interfacing with the inside surface of the body member of the distal hub member; and f. an o-ring seated within the annular recess of the core member; g. wherein the resilient projection is configured to engage with the catch to couple removably the distal hub member and the proximal hub member, the hemostasis valve forms a fluid barrier preventing proximal fluid flow between a distal end of the longitudinal lumen of the distal hub member and a distal end of the sealing member, and the o-ring forms a fluid barrier between the distal end of the longitudinal lumen of the sealing member and the internal cavity of the proximal hub member.