Patent ID: 7897123

Claim:
A reagent vessel with a cap comprising: a reagent vessel able to stand without any support and having a shape of a long and narrow trapezoid in plan view, the reagent vessel comprising: a cylindrical opening with a male screw around an outer periphery of the reagent vessel at one end of a top of the reagent vessel; and a locking plate projecting from an other end of the reagent vessel; the cap having a shape of a hollow cylinder and comprising: a female screw around the inner periphery, the female screw being in engagement, with the male screw of the reagent vessel; a sealing member for sealing the opening of the reagent vessel; a pressurizing member linked to a retaining part for the sealing member to bring the sealing member in close contact with the opening all the time; and integrally having a laterally long housing with a top and a back at a part of the outer periphery, the housing having an opening at the top and flexible plates on the back, wherein when pressure is applied, the pressurizing member lifts the sealing member against a biasing force of itself to open the vessel, and when the pressure is eliminated, the pressurizing member returns to a position by the biasing force to close the vessel by the sealing member, wherein the sealing member, the retaining part, and the pressurizing member are capable of mounting to the opening of the vessel containing a reagent.