Welcome to JOF. Just take a peek under its belly for tubes - if you find others and if there's no valve, look in the space above them for a panel to gain access. Mine has a panel on a vertical wall in the basement that when removed, let's mt open the low point drains.
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2019 Pinnacle 36 FBTS
2016 Silverado 3500 CC SRW DuraMax/Allison
1975 Corvette for the sunny days n dry roads
2017 RZR for the rainy days n muddy roads
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