I mentioned earlier in this thread I build replacement tanks. Have built several for Parkers. I have seen tanks in Parkers completely ate up with corrosion and electroloysis in 10year boats including one a Parker. I have seen other boats 25yrs old where they tank looked brand new, including a few Parkers. However I would say 75% of the tanks I replace are in boats from 15-20 yr old. What I can't believe is the prices some of you are having to pay for tanks. I am building a new 143 gallon tank next week. The aluminum will be here Tuesday and it will cost $239. A new Wema sending unit is $68. New fill spout, new vent, and 2 new pick up tubes and fittings will run me another $50. This tank is going in a boat being refurbished for re sale so the guy wanted to go with 1/8" 5052 H32 aluminum. It will take about $50 of welding supplies. Build time will be between 6-7 hours.. I am charging the guy $1430. So I will clear almost $1000 for 7hrs of work. Normally I would use 3/16" for a tank this size and spray with a self-etching paint which would be about $250 more than the bare metal 1/8" thick tank.