Easy to inflate and to deflate - Double seal leak protection - Wrench provides easy and reliable removal and installation of boat air valves - Air Valve Comes in three parts: one inside part, one outside part and valve cap - Easy to inflate and to deflate - Double seal leak protection - Wrench provides easy and reliable removal and installation of boat air valves - Fit for most types of 8 spoke valves - Top diameter: Approx 6.5cm / 2.6 inch - Bottom diameter: Approx 4.2cm / 1.7 inch - Height: Approx 5cm / 1.9 inch