Re: Another Big Twin Observation…. Home › Forum › Ask A Member › Another Big Twin Observation…. › Re: Another Big Twin Observation…. chris-pReplies: 2456Topics: 153 August 13, 2018 at 8:35 pm #81096 Why would the air line that pressurizes the pressure tank not need a vapour sepearator on it? Just trying to figure this out…..