'68 GT re-do: How many plumbing vents??

[luvoldstuff]

I'm about to start plumbing my gutted '68. The original system had 3 vents penetrating the roof. Now that we have "studor type vents" to use, I was thinking I would just use the one roof vent that used to service the kitchen sink (the oval pipe) and then put a "one-way" vent at each fixture?? Will that work?
Both the black and grey tank will be vented through that one roof outlet.
I will remove and plate the others.

[luvoldstuff]

Sewer and drains share the same vents in a house, but not sure if that is okay in a camper??

[68 TWind]

I had 3 vents on my 68 TW, one for each drain. Re-routing might be more work than just using the original design. I think the original style vent covers look just fine, I don't like the modern ones for a 68. You can get the correct style vent covers for a 68 from VTS: Airstream Plumbing Stack Cover.
I purchased a couple and the quality was very good.

[luvoldstuff]

Thanks, Yes I saw those, I was hoping I could get away with one roof vent with a fixture vent at the sinks and showers??? You don't get sewer gases in a house through your sinks because of the traps so I was hoping to do the same in the AS.

[Minno]

I combined the two vents we have in our '72 into one vent going out the roof. This single vent opening vents both the gray tanks that I added and the black tank. My advice is if you want to connect both gray and black tank vents together, you do so high enough so that if either the black or gray tank fills, you know it well before you could get spillage from the black tank into the gray tank via the vent plumbing.

I also used air admittance valves at the kitchen and bathroom sinks to allow air into the drains while water is draining. They work very well.

Chris

[68 TWind]

My Trade Wind shares a vent stack for the lav and the black tank and it is on the curb side. There were two vents on the street side, one for the shower and one for the sink. Thinking back I can not see any time saved in tying the shower and sink vents together on the street side. You would have to make a patch to cover one of the vent stacks anyway so why not just put a new cover on it? I did learn to make sure there is water in the traps after travel as the motion can cause them to empty. This is a real issue when hooked up to full service as the grey line is open to the sewer on 68's. I actually use a plug in the shower drain since we never shower in the trailer to keep sewer gas from coming in that way. I learned this lesson the hard way. First time in a full service campground the bathroom smelled terrible for a day until I figured out where the smell was coming from. We had stuff in the tub (it is our catch-all for junk) and I did not think about the open drain with no water in the trap. Duct tape fixed the problem and I bought a tight fitting plug for it.

[luvoldstuff]

I now have separate black and grey tanks, and yes I thought about tying in as high as possible with the grey vent line. I am totally reconfiguring closets and such so I want to be as flexible as possible and not have pipes in every closet.
I have plenty of aluminum and olympic rivets, plus I'd have to buy and install 3 new vent covers(more possible leak points), so one would solve that if possible??
I can still go either way.
I tried to see how many vents are used on the newest models, because it seems I can only see one- but couldn't get a good roof picture online??

[luvoldstuff]

Anyone with a new(er) airstream confirm that some just have one vent through the roof?
Putting my flooring down today, I'll wait for more confirmation. (that its okay to just use one vent stack!)