Not what I expected.  Assembly instructions not complete. Green plug is threaded. Nothing in instructions about this. It is for the discharge port which is not threaded. I turned in as much as I could but a slight bump & it pops out. Fortunately, it stayed in until I went to empty the bucket.    Mops are not made for tight spaces; too awkward to rinse & spin; only holds about a 1 1/2 gal of water if you want to rinse; tips to use the 2 ounce spray bottle is not an efficient way to wash floors; I do like that bucket has wheels & you can spin dry the mop head; 3 mop heads are good because you can use a different one for different areas , but all I got have plastic rings & these cannot be machine washed according to instructions. I'll stop for now.