To better show how I drain water tank and NOT spend $100 installing a valve, I unhook a fitting between tank and water pump and let tank drain in bilge.
I take fitting and depress inner gray portion releasing hold of o-ring on pipe, then pull pipe out of fitting letting plumbing sag into bilge. To reconnect, just press pipe back into fitting til it bottoms out, try to pull apart, it should be solidly connected.



If you were to add a valve, there is only a need for one valve to drain the tank. This line between the tank and water pump is all that is needed. To drain the hot, you just open hot water heater drain.
I did install a an RV style winterizing kit (Tee inline just before water pump, with valve) I can select whether to draw water from tank or flip valve to draw from anti-freeze jug. Also installed a water heater bypass kit, so I don't have to fill water heater with anti-freeze. I can winterize entire plumbing system with just over 1 gallon of anti-freeze and the water pump does all the work.
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2000 248 5.7L DP
'92, '94 SXI 750, '08 STX 15F, '12 Ultra LX 300
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