holding tanks
Ron, I had the same thing happen with both holding tanks on my H430. When I contacted Hunter, they gave me the name of the tank co, ENZO (I think). They told me they could not locate the plans for the tank, somebody had 'mis-filed' them. They admitted that about 10 years ago they made the tanks 'to thin' and that they were building better tanks now. The way I solved the problem was to install a LectraSan in my bow head, and a plastic tank from RONCO PLASTICS for the aft head. They have a catalogue on line with hundreds of sizes and the guys at the factory are great to work with. Call Rich, (714) 259-1385 after you check them out on line, ronco-plastics.com and it will save you lots of time & trouble. We were able to find one of their tanks that fit well enough so we didn't have to have one special made. If your boat is old enough to have a tank problem, also check your hoses, you might as well replace them now so you don't have to play in the bilge again in a few years. I added a Y valve so now we can dump overboard when we are off the coast, and use the tank when we are in the Bay or close to the coast. Take lots of time to measure where you want to put the tank, and you might even think about changing the kind of head arrangement you have at the same time. Several peopke urged me not to use a bladder, and the more I read the more I agree. Good luck on the cleanup job, make sure you have ventilation when you use the bleach.