Patent for a new and improved pump. This design consists, "with the working-barrel, of a casing or shell secured to the lower end of said barrel, the said shell tapering downward and being provided with an annular shoulder on its inner surface, a valve-seat provided with an annular flange and downward elastic extensions constructed to close against said shell and rest on said shoulder, and a valve-cage connected with said seat and containing a valve" (lines 82-91).