Includes two types of Boston Valves to fit most brands of towables including Airhead, SportsStuff, Sevylor, Connelly, and Rave. Valve 1 measures 0.6"D x 0.9" diameter. Valve 2 measures 0.7"D x 0.8" diameter.
Will not fit Gladiator and O'Brien towables. For O'Brien and Gladiator towables with Boston valves, use item #19163.