An inexpensive and easy to use coupling for connecting one end of a corrugated flexible hose to a meter or distributor outlet, or to another hose on an implement such as an air drill or seeder. Two generally semi-cylindrical portions are molded as a single unit with integral hinge and locking structure....http://www.google.es/patents/US4795197?utm_source=gb-gplus-sharePatente US4795197 - Coupling for seed and fertilizer hoses
