I have designed a system that will include two tanks directly behind the toilet. One tank will be an eight gallon tank. The other will be a five gallon tank. The eight gallon tank will be permanant while the 5 gallon tank will be designed to be removable. Through the use of Y- valves I will be able to pump out either tank. However, if the need arises I will be able to elmpty the portable tank in a nearby toilet or, heaven forbid, over the side in an emergency. This arrangement will allow me to do away with the overboard through-hull which was one of my goals. I know there are some A-30s that have more than the 13 gallons that I will have, but I felt this system will meet my needs best while using the unused space behind the toilet. John Bailey, "Zevulun" #33 > Has anyone installed a holding tank for the head? If so, what type was it (flexible or rigid), what size was it (gallon capacity), and, most importantly, where did you put it? > > Thanks for your comments. > > Lisa

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