Replacing Holding Tank on a Hunter 37.5 To remove the tank we had to hacksaw the fittings off, removal took about 1 hour. Now we had to find a replacement tank, so we called Hunter, they said it would take about 4-5 weeks to get a aluminum replacement tank, of course we would never use aluminum for waste, so we got onto sailboatowners.com and found Ronco Plastics. I faxed the location for the fittings to Rich at Ronco on Tuesday and received the new tank on Wednesday. Now that’s service !!, and the price was so low that I tried to convince Rich to charge me more, but instead he gave me a discount. If you are in need of a tank, I highly recommend calling Rich (714-259-1385). The replacement took about 3 hours, with most of the time spent on hookup.