The JP Grime Gutter for JP277/377/278/378 Tuba is a specialized accessory designed to enhance the maintenance of specific tuba models. This attachment is strategically positioned at the bottom of the valve casings, serving the purpose of capturing any drops of oil and moisture that may accumulate during playing. Constructed as a one-piece metal unit, the Grime Gutter is both durable and easy to clear, requiring minimal maintenance.

The primary function of the Grime Gutter is to prevent excess moisture from entering the valves or other sensitive areas of the instrument. By doing so, it aids in preserving the overall condition and performance of the tuba. This accessory proves to be a practical addition for players who prioritize the longevity and optimal playing condition of their instruments.