Black water tank replacement

[Kendussome1966]

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 .

[mmwjr]

Why do you want to do this? Don’t you have access to a waste pumping station? How do you plan on collecting and disposing the waste?

[Kendussome1966]

The same way you would empty out an RV trailer

[Kendussome1966]

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 .

[MoonRiver]

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.

[mmwjr]

Originally Posted by Kendussome1966

The same way you would empty out an RV trailer

Never done so no idea!

[mmwjr]

Originally Posted by Kendussome1966

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.

[Kendussome1966]

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 .

[Kendussome1966]

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 ��

[shrew]

Originally Posted by Kendussome1966

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.

Originally Posted by Kendussome1966

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.

Originally Posted by Kendussome1966

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).