Flexible drinking tube with check valve

Claim 1

A drinking tube having at one end a valve, said valve comprising a casing defining a valve body having top and bottom members defining a valve chamber having a bottom, a top and a vertical wall, an inlet port in said bottom member, said bottom member having a valve seat in registry with said inlet port raised above said bottom, an outlet port in said top member, said tube being connected to said outlet port, a flapper in said chamber having a disk larger than said seat, a lateral extension of said disk near said vertical wall, said extension being formed with opposed cutouts, one of said members having studs extending through said cutouts, a hold down extending from said top member toward but spaced from said bottom member, the lower end of said hold down retaining said extension between said studs, and at least one stop on said top member limiting movement of said flapper beyond open position, said studs confining said flapper from lateral movement away from said vertical wall, said hold down and said valve seat confining said flapper for wobbling movement between a closed position with said disk in sealing contact with said seat an an open position with said disk slanted away from said seat.