The Tank Snake is offered in three different types; INSTANT, REUSABLE, and the MOBILE FUEL LIFE version. The INSTANT Tank Snake is designed as an immediate water remover for one-time use. The REUSABLE Tank Snake is designed for long-term preventive water and rust particle removal. The MOBILE FUEL LIFE Tank Snake was designed with semi-trucks in mind to continually remove water and contaminants still suspended in diesel (for fuel that doesn’t sit long enough for water to “drop out” before intended use). The MOBILE FUEL LIFE Tank Snake also stabilizes fuel and increases longevity. See Tank Snake Sizes Here