Protect yourself from fuel contamination by visually checking the fuel for water and debris. The unique snap-on probe fits all quick-drain valves, stores compactly, and reduces spillage, loss, and probe breakage. The 4" (10.16 cm) transparent cylinder has the octane color-coding moulded in the side for quick reference. Also includes a chrome-plated screwdriver blade with both a Phillips and a slotted head.