Clean area with three betadine swabs using circular motion, moving further outward each time. Put small amount of betadine ointment on a 2x2 gauze pad and place over tube where it enters the chest. Tape it in place. Wash hands thoroughly. Clean off end of clave cap with alcohol.
Screw syringe onto blue clave cap.
Clamp off tube. Wash hands thoroughly. While clamp is on, unscrew old cap. Clean grooves of catheter with alcohol. Screw new cap onto end of catheter.