Main Motorcycle: 2009 Bonneville SE
Join Date: Jun 2009
Location: Asturias, Spain
Other Motorcycle: Yamaha XV1100
Extra Motorcycle: Qingqi QM200GY-BA
Yes, item 18. It's a combined pressure switch and banjo oil connection as well. I don't think the crush washers come with it so I'd replace them as well (item 19x2).
There will only be a little oil dribble but place a rag on top of the crankcase to avoid any mess.
Follow Mikeinva's advice for removal, it's on post 3 of this thread. Torque is 13Nm (About 10 ft/lbs). It's not much, but as you have to use a rather large wrench due to the 22mm hexagon, there's the possibility of overtightening due to the excessive leverage.