Here we are, question #3. 2000 carver 356 aft cabin. Vacuflush unit issues. Last week I replaced the water valve (pedal-flush) because clean water was leaking out from it to floor out of unit. Simple inexpensive change and I was happy. Now the front has issues. Not sure same issue so I ordered the same water valve part and also seal replacement. Here is the problem, since purchase (1.5 months ago) front head was flashing full few days after pump-out, even though not used. Now smell started coming out of it. And I had it pump-out 4 times in 1.5 months already. The water seems to stay in bowl, so it's not leaking, but something is leaking and tank indicator shows its getting full. So I am assuming its the valve, unlike stern, maybe this time it is leaking into the tank, as that would make sense tank is filling up. Not sure I need to replace the seal as the water seems to stay in bowl, but how can smell come through if that's the case? maybe 2 separate issues, leakage being one that fills the holding tank, and seal causing smell issue? Any ideas from anyone is greatly appreciate it.