The Cylinder Bottom Brush Kit allows the inspector the ability to spot clean the bottom of a high pressure cylinder. The stainless steel brush will fit into an opening at least 1/2" wide. The unique system is designed to store the wire brush, protect the threads of the cylinder during its operation, act as a guide, and then be used to re-store the brush without having to touch the brush. Brush is collapsible and can be resized for any cylinder.