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Old 11-13-2018, 10:08 AM
TCUMasterCraft TCUMasterCraft is offline
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Join Date: May 2018
Boat: 2003 MasterCraft X30
Location: Southwest
Posts: 18
What Is This?

I bought an '03 X30 this spring and maybe should have asked more questions but the seller didn't know a wrench from a screwdriver. While I was winterizing the boat this weekend i ran across this in the bilge. I'm guessing in the first picture this is a way to close off the lake water intake from the lake and hook a hose up add antifreeze to the system? I think the 2nd picture includes a backflow valve.

I also didn't realize how dirty the bilge was.... clearly at some point this boat had a lot a water down there that sat for an extended period of time.
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Old 11-13-2018, 10:22 AM
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CantRepeat CantRepeat is offline
Join Date: Jul 2008
Boat: Passively looking for a CSX 265
Location: Roll Tide!!
Posts: 15,071
The red handled seacock looks like a shut off valve for ballast water intake. The white fitting with the screw on cap behind it is used to get anti freeze into the ballast pumps/hoses/tanks.

Next time you have the boat out, turn the bilge pumps off and fill the bilge with some water. Add a cup of dawn dish soap and then tow the boat home/around. Once you get home drain and rinse.

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Old 11-13-2018, 10:35 AM
gweaver gweaver is offline
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Join Date: Aug 2011
Boat: 2003 VRS 230 w/X-boat package, 8.1L
Location: Northern California
Posts: 1,394
A bit hard to tell from the photo (location would help) but it looks like the intake for ballast with the seacock on it. If this is on the port side, it's the ballast intake. Raw water intake is starboard side. I have the same boat, and don't recall seeing a seacock on the raw water intake. I think there should be one, just haven't noticed one on my boat. Will try to get out today and see if I can confirm.

As far as cleaning, what Can't Repeat said. Folks have also recommended LA's Best (I think it's called) Cleaner. You can pick it up at the Dollar store. Same process- ballast pumps off, water in bilge, add soap/detergent, drive around, drain. Might need to do it a couple of times.
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Old 11-13-2018, 08:13 PM
TCUMasterCraft TCUMasterCraft is offline
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Join Date: May 2018
Boat: 2003 MasterCraft X30
Location: Southwest
Posts: 18
That is on the port side of the boat.

Is the antifreeze just to protect the ballast pumps? I wouldn’t think it would matter if the water in the tanks were to freeze.

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Old 11-13-2018, 08:40 PM
trunderw trunderw is offline
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Join Date: Apr 2007
Boat: 2008 X-14 MCX w/Powerslot
Location: lake anna
Posts: 472
If the tanks have enough water in them and freeze, they'll crack...
boats rock, but don't rock the boat
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