Hey Rob, so happens I use a similar system. Just use two lids.
I got the 3" RV (clean out) fitting and a separate garden hose (water-in) fitting at a local RV store. You can peel the steel ribbing out of the inside of one rocket box lid with a crowbar. It is spot welded on, and with some pressure it will peel out, leaving just a flat lid. You can then caulk or glue the rubber gasket on. Drill your holes, caulk and put on your fittings. Leave THAT LID AT HOME (it doesn't need to be on the river) and just use it when you get home to flush into your septic system. Use a different, unadulterated lid on the river. If need be you can take the clean-out lid to show to the ranger, but leave it in your truck. After awhile I just started leaving mine at home and explaining the system. Most rangers understand. So when you get home you just switch lids and whoalla! Poop-B-Gone!
By the way, to me this is still the most effective system going. Big wide opening below your seat, directly into the rocket box, eliminates the mess of dealing with all the plastic fittings and small opening associated with the Eco-Safe units. The rocket box, even if not powder coated, is very hard steel and won't rust out or through anytime soon. I have one I've been using close to ten years. If it rusts through for $20 bucks I'll just get another one. It's simple, and it works.
Finally, I happen to be lucky enough to have one of those old-school fiberglass toilet seats shaped especially to fit a 20 mil rocket box. These went out of production a long time ago. Sure wish I could find another one. They're smaller, lighter and have tabs on each end that slip inside the box to keep it in place. To me it's a prize possession. If anyone knows who made these or where to get one, would love to know.
Buena suerte! Happy groovin!
Originally Posted by Robpineau
Has anyone tried to use these bolted bulkhead or tank fittings directly on an ammo can for fresh water and RV clean out? I have a septic so I usually get grover duty but I am thinking that if this may be a way to make things easier without spending a lot of money on poop?
Would this idea be durable enough for river use? I found stainless steel ones that are cost prohibitive, and plastic ones that look too weak wondering if these might be a good fit?
Polypropylene Bolted Tank Flange with EPDM Gaskets | U.S. Plastic Corp.
I was thinking about doing a plug/cleanout coyote system.