11190 Seal, Shaft seal for Read Screen-All Screen, model RD-90. This is the “notched type” seal.11190 Seal, Shaft seal, used on the RD 90 power screen. This part is used on the motor and non motor side. This will be item number 19 from the Read drawing. Please check your parts book to ensure you are ordering the correct part by the part number. If in any doubt provide us the model and serial number of your machine and we'll cross check the part for you. That process could take a few days as this information comes from books and is not in digital