<P>I have had to change over 2 metal tank's this year to plastic,o ring's blowed out,can have them replaced but would cost about 50-60 buck's mostly labour can do it yourself for about 10,but the way the plastic's are made nowaday's, why not just go with the the plastic ones ? total cost of 6 gal tank,and adaptor,28 buck's and they hold paint extremly well,also they have a lower profile,just get the size that fit's the boat! I have been a metal tank owner prior to this,not that metal tank's are bad, mine just seen there last day's for now!any info on how to store these,old,broken down tank's just not ready to 86'em. tank's. </P>