Slip-on Welded Bow Spring Turbolizer General design, Features, and Characteristics are the same as Hinged Welded Turbolizer. The Collars are specially designed with roll-formed peripheral ridges which provide Them extra rigidity. These Turbolizers are used for direct installation on the pipe by slipping on and it can be provided with a Setscrew for the elimination of the Stop collar. Slip-on Welded Bow Spring Turbolizer undergoes a special Iron Phosphate coating process to prevent them from Rust and is then coated with special Polyester Powder. It has a deflector blade fitted on a standard bow spring which creates a difference from the standard centralizers.