What am I?

Cover the clues so you can only see number one. How many clues do you need before you know the answer?

1. I am called the Star and I am used inside.
2. One hand holds the pipe end on the floor while the other hand pumps madly.
3. I worked by suction.
4. I kept house cleaners fit.
5. These days people plug us in and you don't need to be too fit to use us.

Answer in next week's TreasureLink.