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Old 01-10-2020, 12:11 AM   #1
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Default Black water tank replacement

I have a 1990 2700 scr and I'm thinking about changing my 15 gal black water tank for a larger 20 gal tank and plumbing it so I can empty it out like a RV at the campgrounds and lakes that I go to . I would install the plastic pipe under the rear deck in the engine compartment and out through the transom below water line with a ball valve at the tank . Does this sound like a good idea or what do you all think .
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Old 01-10-2020, 01:29 AM   #2
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Why do you want to do this? Donít you have access to a waste pumping station? How do you plan on collecting and disposing the waste?
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Old 01-10-2020, 02:50 AM   #3
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The same way you would empty out an RV trailer
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Old 01-10-2020, 02:56 AM   #4
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A pump out costs $75.00 in the okanogan in bc Canada at the marina . There are free RV sanitation dumps at every gas station . So I would just hook up the hose and open the valve and deposit the waste in the sani dump . No different then a trailer . The only difference is my RV floats .
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Old 01-10-2020, 04:45 AM   #5
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You just need to be careful and never let waste out into lake. I have a macerator pump but is has to be disconnected because of accidental discharge into a lake.
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Old 01-10-2020, 05:27 AM   #6
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Quote:
Originally Posted by Kendussome1966 View Post
The same way you would empty out an RV trailer
Never done so no idea!
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Old 01-10-2020, 05:29 AM   #7
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Quote:
Originally Posted by Kendussome1966 View Post
A pump out costs $75.00 in the okanogan in bc Canada at the marina . There are free RV sanitation dumps at every gas station . So I would just hook up the hose and open the valve and deposit the waste in the sani dump . No different then a trailer . The only difference is my RV floats .
I would not use a plastic thru hull fitting below the waterline,IMO.
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Old 01-10-2020, 10:48 AM   #8
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Most definitely, dumping raw sewage into a lake is the most disgusting thing in the world ,I've seen people do that and I have called the local authorities and reported them . But for sure I want to make sure there's no chance for a spill or leakage .
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Old 01-10-2020, 10:51 AM   #9
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I'm thinking of using stainless steel through the hull and neoprene hose to connect to the waste holding tank ball valve . Thank you for your opinion I appreciate it ��
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Old 01-10-2020, 02:57 PM   #10
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Quote:
Originally Posted by Kendussome1966 View Post
I have a 1990 2700 scr and I'm thinking about changing my 15 gal black water tank for a larger 20 gal tank
Great idea! I do so in my 2800. I wish I could have gone larger.

Quote:
Originally Posted by Kendussome1966 View Post
and plumbing it so I can empty it out like a RV at the campgrounds and lakes that I go to .
If you trailer the boat, this is also a great idea.

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Originally Posted by Kendussome1966 View Post
I would install the plastic pipe under the rear deck in the engine compartment and out through the transom below water line with a ball valve at the tank . Does this sound like a good idea or what do you all think .
You would need to install a seacock at transom or through hull. That is how mine works now, only there is a macerator pump. I open the seacock and turn on the pump and it discharges the tank. (3 miles out to sea in legal discharge zones).
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