Use a valve casing brush with PrestoValves Formula HLF solution or Valve Stripper in order to thoroughly clean the casing internally. This is as important as cleaning the piston or rotor. Designed for brass instruments with pistons, this valve casing brush features non-abrasive nylon bristles which prevent scratches and keep your valves casings clean. Choose the other Casing Brush Picture if you are purchasing along WITH another PrestoValves Product! For single purchase without purchase of another PrestoValves product.