I had to purchase another Air Volume Control for my well because the old one quit working which caused the water pump not to operate properly and fed air into the waterlines to the house.The Campbell Deep Well Air Volume Control valve was highly recommended to me by people I trust so was confident it would do what I needed it to do. Not only was it the right part for the job but it was so easy to install and position correctly the "first" time that even I, a woman without experience working with the item, was able to get it installed right.