Don't know what you mean by 'tube' but the 0880 is a cone shaped filter, about 14" long.
You can get one from various places like Summit Racing for $40-50. There is also a pre-filter sock you can get for it, but since your in Seattle I'd doubt you'd have much need for it.
You might also want to look at aFe's equivalent. I just put one in yesterday. Don't know if it is any better then K&N's, just wanted to try something different. I will be putting a sock on it.
With either unit, you'll need a 1" wide piece of 4" exhaust pipe to fit inside the filter, then your snorkel will go over the filter base, and clamp it up. Works great.