What am I?
1.I am about one metre high, made of wood and I am sealed to hold liquids.
2.I was once found in farm kitchens or in the dairy shed.
3.My handle continues inside the container but widens at the bottom.
4.Without cream from the cows I couldn't do my job.
5.My operator plunges my handle up and down to change the liquid inside.
 
Last week's answer:

I am a nail buffer. I helped shine finger nails.