Not to knock the Wonder Pump, but the Wonder Pump sucks balls. Ok, I guess I'm knocking the Wonder Pump.
It's great for pool toys and maybe a beach ball, but for inflating rafts or topping off, it's a total waste of money. It will break, you will use duct tape to try to fix air leaks, you won't get your Culebra as tight as you want it, you will be jealous of people who bought pumps that don't suck, and people who have real pumps will laugh at you at put ins. Spend the extra money now for a real pump and you will be glad you did.