Abstract: A knotting device includes a rectangular hollow member including holes, four knurled tunnels on a bottom, and four hooks at four corners respectively; four legs extending from four corners of the rectangular hollow member respectively, each leg being hingedly connected to the rectangular hollow member, and an end latch configured to secure to an adjacent one of the hooks; two first fastening members hingedly secured to two ends of one side of the hollow member respectively, each first fastening member including top projections configured to securely insert into the holes, a first knurled section on a top, and a second knurled section on a bottom; and two second fastening members hingedly secured to one first fastening member, each second fastening member including top projections configured to securely insert into the holes, a first knurled area on a top, and a second knurled area on a bottom.

Abstract: A knotting device includes a rectangular hollow member including holes, four knurled tunnels on a bottom, and four hooks at four corners respectively; four legs extending from four corners of the rectangular hollow member respectively, each leg being hingedly connected to the rectangular hollow member, and an end latch configured to secure to an adjacent one of the hooks; two first fastening members hingedly secured to two ends of one side of the hollow member respectively, each first fastening member including top projections configured to securely insert into the holes, a first knurled section on a top, and a second knurled section on a bottom; and two second fastening members hingedly secured to one first fastening member, each second fastening member including top projections configured to securely insert into the holes, a first knurled area on a top, and a second knurled area on a bottom.

Abstract: An process of manufacturing an automotive fuel tank is provided with preparing a cover formed of stainless steel, the covering including a closed edge and a space; preparing a main body formed of stainless steel, the main body including a closed edge and a space; aligning the closed edge of the cover with the closed edge of the main body; and securing the cover and the main body together by welding along the closed edges.

Abstract: An automotive fuel tank is described and includes an upper shell including an opening and a flexible, protruding bottom edge; a filling pipe secured to the opening; and a lower shell including a flexible, protruding top edge secured to the bottom edge. The automotive fuel tank can withstand collision without causing cracks.

Abstract: A T-shaped pipe fitting includes three tubular branch lines each having a plurality of stepped sections of different outer diameters. Embodiments of the T-shaped pipe fitting are provided. Other pipe fittings having the characteristics of the T-shaped pipe fitting are also made possible. No reducer is required to connect pipes of different diameters to the T-shaped pipe fitting.

Abstract: An automotive fuel tank is described and includes an upper covering including a flexible, protruding bottom edge; and a lower covering including a flexible, protruding top edge secured to the bottom edge. The automotive fuel tank is structurally strong and can withstand collision without causing cracks after a long period of time of use.

Abstract: A vent valve mount of a fuel tank includes a plurality of support rings each including an opening, a circular top platform greater than the opening, and a wall extending from the top platform to the opening; and a plurality of hollow, circular seats disposed on the fuel tank. An inner surface of each seat is secured to both the top platform and the wall of each support ring.