You DO NOT have to remove the tiny front wheels or rollers! You also do not have to remove the whole top and disconnect that electronic connection. BUT what you need to know is to disconnect the hose from the lower end it requires no force if you get a small flat screwdriver underneath the collar and give it a pop. When putting in the new bilge pump hose, cut off the straight non ribbed portion of it and discard. Connect it to the top piece first by twisting COUNTER CLOCKWISE. Sorry I didn’t measure the length for you so you’ll have to guess at it. Then insert it into the bottom collar also Counter Clockwise until you’re unable to twist it. Getting it back together is a little tricky too especially snapping all that plastic together. It will go just make sure the top piece with the hose fits Those grooves. I also don’t think you need to remove that screw and whit plastic clip in Diagram #5 either.