QUESTION:Yesterday I was running my route and saw a competitor’s vacuum truck. I was behind him at the red light. I saw two things I wondered about. First, the suction hose on top of the tank was connected to a valve that looked like a knife gate, then the valve was connected to an elbow welded directly to the tank. I have not seen that type of hook-up.My first question is: What was the need for that valve hooked directly to an elbow? There is already a banjo valve at the other end of the hose. Please explain. Is this
