QUESTION:
I’m looking for an explanation or a description of how the primary shutoff works. Maybe I’m confused, but it seems the secondary should be plenty protection for a vacuum truck. What can you do to help me understand the primary and why it is so important?
Jack Hempstead, Billings, Mont.
ANSWER:
The purpose of the primary shutoff as well as the secondary moisture trap is to provide protection for the vacuum pump. This is accomplished by making sure that waste — solid or liquid — does not work its way into the vacuum pump, where it can cause damage and prompt expensive repairs.
