Plumbeeze submersible torque arrestors protect submersible pumps from starting torque damage. They are field adjustable to hold the pump centered in the well and fit snug in all well casings from 4 to 8 I.D. To install securely fasten to 1 or 1-/4 drop pipe with stainless steel clamps that are provided. There are infinite adjustments enabling the installer to obtain a proper fit.