It's probably glued to the PVC going to the tank and maybe even to the floor. You'll probably have to grind/cut off the top, maybe just around the edge, to release the pipe and tank. Use something like a Dremel or other rotary tool, or you could get aggressive and use an angle grinder. Just don't grind into the floor itself.
Hooking it all back up with a new flange & union may be a little trial and error to get everything to fit, but it should work out fine.
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'06 F350 Lariat turbo diesel dually, Curt 20k, Softopper, Aerosheld, coolant filter, air bags
'10 3665RE Hickory, wet bolts, Trimetric battery monitor, 4 100w panels & Morningstar TS-45, still tweeking!
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