This is for my 2016 Ferris is600z. I used a hex key tool for the top drain port. I was able to loosen plugs using the below hex key, it's 1/4". You can see the plug from under the seat.(did not have to go under the machine) I just had to reach my hand under and get the hex key attached. One side was harder than the other, but both loosened fairly easily. I hope this helps someone.