Your Moomba does have a drain hose ("EZ Drain")connected to the bottom of the crankcase, and there's a lot faster way to drain the oil than letting it seek out that that hose through the bilge drain hole.
Here's a link to post about the "adapter" I put together to connect EZ drain hose to a vacuum-type oil drain device (they used to be sold by "Tempo," but now they have a different name).
http://www.wakeworld.com/MB/Discus/messages/65921/100113.html?1077646658 It takes maybe 10 minutes to drain hot oil from the engine.