| abstract |
A first arched surface ( 2 ) having a lower end fenestration ( 4 ), protruding from a tubular body ( 1 ), intersecting it along a closed oval perimeter ( 5 ). n A second arched surface ( 7 ) placed with body ( 1 ) facing first surface ( 2 ), with an upper opening ( 8 ). Both surfaces ( 2,7 ) are related through this same perimeter ( 5 ) with identical cross sections. Body ( 1 ) and both arched surfaces ( 2,7 ) are made of a waterproof material. n Surface ( 7 ) is elastically deformed along said perimeter ( 5 ), having means capable of displacing it between two operative positions. n When both surfaces ( 2,7 ) have opposed convexities of different sign, they establish a passage ( 9 ) communicating inner tubular body ( 6 ) through said opening ( 8 ) and fenestration ( 4 ). n When surface ( 7 ) acquires a same sign convexity to first surface ( 2 ), it settles against the inside of ( 2 ) closing passage ( 9 ), fenestration 4 and opening ( 8 ), with a sealing relationship. |