Pacer HVAC controls with Vacuum tubes Apr 2, 2007 13:30:54 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by cambrian on Apr 2, 2007 13:30:54 GMT -5 HVAC control cable with tubes. A good idea to have as this is a moving part with rubber hoses. A sure thing to wear out eventually. Ebay item 140103445892