There is also significant scuffing to the seat from rubbing on the valve cover. Lastly, it appears that there is a seat retention screw at the front which may be missing. Otherwise, it appears that all parts are included. Unit can be installed with or without the valve concealment cover, depending on the specific application.Sloan Regal 111 (3980116) 1.6 GPF Left Side Stop Flush Valve. Toilet requires a minimum of 25 PSI flow pressure. Trap has a minimum 3-1/2 seal. ASME A112.19.3, CSA B45.4. This item is in the category "Home & Garden\Bath\Toilets & Bidets\Toilets".bob" and is located in this country: US. This item can be shipped to United States.