I can't find an answer to this question. On a 15 gallon tank with the external roll over and liquid check valves. do I really need them? This will be a DD not a wheeling rig. If I don't need them, what do i need to do with the 2 lines coming from the tank to the LCV? Can I just plug them or loop them? Can they be bypassed for the short term? I know about the DeLorean roll over valve replacements but is there a LCV replacement?