Drew's Doser v2.0 Dosing Pump Replacement Tube The tubing in the Doser's head may break after a few years of use, putting undue strain on the motor. To extend the pump's lifespan, we advise replacing the tubing once a year. constructed using chemically resistant Tygon A60G-3 tubing. Outstanding Flexural Fatigue Score Use Drew's Doser Tube Lubricant for a simpler replacement. What Does It Include? One new dosing tube