CHARACTERISTICS AND OBJECTIVES OF THE INVENTION 0001 A drain apparatus can be one of two shapes, i.e. cylindrical and convex-concave. It is a circular tube with a small tube branching from its side for connecting with high-pressure water or air in order to push a blockage out of the drain. A valve plate is mounted at the junction of the small tube to prevent backward flow and close the end of the small tube when it is in its normal position. And when pressure is fed into the small tube, the valve plate is pushed into the position that closes the upper opening of the drain by coupling with a valve seat that is above the small tube's opening. 0002 The primary objective is to remove a blockage in the drain regardless of the drain's position. 0003 Another objective is to increase convenience and save money, time and labor. There will be no need to disassemble the drain, to use a shooting device nor to buy a toxic substance to corrode the blockage in the drain and this last practice is fatally dangerous to human, animals and harmful to the environment.

RELATED ART 0004 The present invention is related to civil engineering.

PRIOR ART 0005 A regular drain is a circular tube. After it has been used for a long period of time, bits and pieces will gather inside the tube and block it and water will not be able to flow through it. This leads to problems in bathroom and kitchen sinks, bathrooms etc. In addition, there will be a stench which travels up the drain and fills the bathroom and house with an undesirable smell.

BRIEF DESCRIPTION OF THE DRAWINGS 0006 FIG. 1 shows a cylindrical drain apparatus according to the present invention. The valve can be seen in its normal position which leaves the opening open and closes the branch tube. 0007 FIG. 2 shows the drain apparatus with its valve closing the upper opening by coupling with the valve seat. 0008 FIG. 3 shows a convex-concave drain apparatus according to the invention with its valve in the normal position which opens the upper opening, closes the branch tube, and the convex part. 0009 FIG. 4 shows the drain apparatus while the valve is in the position that closes the upper opening by coupling with the valve seat. 0010 FIG. 5 shows connections of drains at several points with a convex-concave drain apparatus at every point. At the first point, the valve closes the upper opening by coupling with the valve seat. 0011 FIG. 6 is a continuation of FIG. 5. It can be seen that the valves close the upper openings at both points.

COMPLETE DISCLOSURE OF THE INVENTION 0012 A drain apparatus with a branch tube and a valve for removing a blockage in the drain that can be connected to bathroom and kitchen sinks, bathroom floor, etc. has been invented. 0013 FIG. 1 is a cylindrical drain apparatus according to the invention. It is a straight, circular tube 1 with a small tube 4 branching from its side for connecting with high-pressure water or air 8. Inside the circular tube 1, a valve 5 is mounted. In its normal position, the valve 5 will close the end of the small tube 4, opens its upper opening so that sewage 7 can flow downward. Also, there is a valve seat 6 over the end of the small tube 4 for coupling with the valve 5 when water and air 8 push the valve 5 to move up to close the opening. 0014 FIG. 2 is a continuation from FIG. 1. While high-pressure water or air 8 is injected into the small tube 4, the water or air 8 will push the valve 5 to close the upper opening by coupling with the valve seat 6. The water and air 8 will flow downward in order to push the blockage out of the drain. 0015 FIG. 3 is a convex-concave drain apparatus according to the invention. It is a circular tube 1 with a small tube 4 branching from its side for connecting with high-pressure water or air 8. A valve 5 is mounted inside the tube 1. In its normal position, the valve 5 closes the end of the small tube 4, leaving the tube's opening open so that sewage 7 can flow downward. In addition, there is a valve seat 6 over the end of the small tube 4 for coupling with the valve 5 when the water and air 8 push the valve 5 upward to close the opening. The convex part 2 is below the small tube 4 and the concave part 3 is lower. 0016 FIG. 4 is a continuation from FIG. 3. When high-pressure water or air 8 is injected into the small tube 4, the water and air 8 will push the valve 5 upward into the position that closes the upper opening by coupling with the valve seat 6. The water and air 8 will flow downward to push the blockage out of the drain. 0017 FIG. 5 shows connections of drains at several points with this convex-concave drain apparatus being mounted. Starting at point 9, when high-pressure water or air 8 is injected into the small tube 4, the water or air 8 will push the valve 5 into the position that closes the upper opening. The water or air 8 will flow to point 10. When the water or air 8 reaches point 10 of the drain apparatus, it will hit the concave part 3 and then flow into the convex part 2. Then, it will push the valve 5 at point 10 into the position that closes the upper opening. 0018 FIG. 6 is a continuation from FIG. 5. When the valves 5 at points 9 and 10 close the upper openings, the water and air 8 will flow along tube II to push the blockage out.

BEST METHOD FOR PRACTICING THE INVENTION 0019 The best method is as stated above and valves should be made from light and floatable materials. These will lead to the invention that is perfect and best.