Be sure that you rinse the unit out thouroughly after each use. You should use the B&G Deluxe Sprayer Maintenance Kit to clean your B&G 1 Gallon Sprayer. It comes with solution, brushes, and full instructions from B&G to properly clean the sprayer. Because the sprayer consists of brass and stainless steel you should use special brushes when cleaning which the kit comes with.
We are not aware of B&G parts such as the B&G 4 Way Tip - Part 5800 working with other model sprayers.
No, the B&G 4 Way Tip Part 5800 does not include a washer.
According to the manufacturer, the output of B&G nozzles is measured in degrees. The B&G 4 Way Tip Part 5800 sprays at a 50-degree angle. The manufacturer also stated that the height of the wand when spraying will also impact the width of the fan. The higher the wand is held the wider the fan will be and the opposite when it is lower or closer to the application site.