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Purpose for multiple drain plugs?

Dagenham Dave

Member
Messages
13
Reaction score
7
Points
12
Boat Make
Yamaha
Year
2019
Boat Model
SX
Boat Length
21
I just bought a 2019 SX210 and am curious. In addition to the main hull drain plug, there are plugs for the engine compartment, the fuel tank area and the sky locker. Please excuse my ignorance, but what is the purpose/logic behind all these plugs? Why not just have holes and the main drain like my last boat?
 
I think they are there to keep water from filling up those compartments if something is leaking up from the bottom.
Alternately, you’re able to drain them if necessary if they somehow get filled up from the top like taking a wave.
 
Some folks have reported water coming into their ski locker from the bilge, so the plug in there will in theory keep water from migrating into the locker while on the water like @AZMark suggests. The reason being that these boats can float a bit nose down.

You may want to check out this thread Replaced my anchor locker drain fitting due to leaks The anchor locker drain has been a source for water entry into our boats due to the crappy thru hull and crappy installation process, see my posts #118 & #125 in that thread for how my anchor locker drain looked from the factory, how I fixed it thanks to @drewkaree ’s posts, and how I keep water from migrating into the anchor locker while on the water. My anchor locker drain is very close to the water line and water will flow freely in and out of the anchor locker without that little snap in drain plug that I keep in mine, and that was why my anchor rode was always wet, as well, the crappy thru hull looks like it was fired from a gun into the anchor locker and was not sealed in the anchor locker so water that was flowing into the locker was leaking around the thru hull and flowing in between the anchor and the hull. I had the opportunity to boat with @drewkaree this summer, I watched him take off one time and as the bow of his 2019 AR210 rose up out of the water a full stream of water was pouring out of his anchor locker drain, so I sent him a couple of those Atwood plugs to help keep the anchor locker dry. I believe your boat has the same hull as @drewkaree and I so your anchor locker could be flowing water in and out as well. Look at post #143 and how @jcb1977 eliminated the pooling below his anchor locker drain.

As far as the other internal drain plugs are concerned, you want to keep the various compartments sealed off from each other, otherwise known as water tight compartments. If water gets into the boat while on the water you want to be able to keep the water segregated as much as possible and in your control so to speak.
 
Yamaha jet boats have a normal hull, and an insert that sits inside the hull. If there weren't drains in the "insert", it would fill up with water. So these drains allow water to drain into the bilge. They also stop water from coming from the bilge back into the boat, thus buying a little float time. That said, boats like these must float for something like 24 hours to pass USCG regulations.
 
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