Just for my clarification, I marked my 2019 400 expansion tank before doing my last flush. I have stayed with Century and not had any issues. When I did my flush and fill 2 years ago I used tap water (many gallons) followed by distilled water before refilling with fresh Century fluid. I believe my flow is like the diagram above so in my case the hookup has not changed. The small and large drains seem reversed in the diagram but NOT the direction of flow.ScottG said:Here's an image from Alde that shows the intended flow of glycol through the expansion tank. It sounds like nuCamp is now hooking these up in reverse. I'm curious to know if there is a reason for the change, or if it makes any practical difference in the operation of the system. Presumably it was designed this way for a reason, but it's not immediately obvious to me what that might be.

The hose from the port on R returns to the Alde and the hose attached to the larger port on L receives fluid from the last convector in the loop.

So when starting the flush with the 12 V pump in my 2019 the flush water is entering on the R hose and pushing fluid thru the Alde and around the loop and out the L hose. In this picture the old glycol is just starting to come out from the L hose below, that hose being attached to the larger port on the reservoir. In the shop vac method the pull would be on the L hose below to drain the system, and the new fluid would be pumped in the R hose.
And as @AnOldUR said, the larger port coming from the convector loop would be a place for any debris in the system to settle and not return to the Alde boiler



I don't think it's fair to judge the products built by one manufacture by a bad experience with a product from an entirely different manufacturer.Cbusguy said:Fiberglass poles are the pits, I never buy fiberglass on purpose and if I am stuck I replace with aluminum as soon as I can.
The entire air tent thing is a gimmick, a few years ago a couple of tent manufactures introduced them. Nemo was the company name I believe, my assistant scout master was the lead gadget man, after a very wet weekend he threw it in the dumpster at the camp. It was hillarious as he got his gear in the truck and drug it a crossed the parking lot and dumped it in the dumpster in the pouring rain. He looked so miserable and pathetic.
We purchased the same tent but with aluminum poles a couple of months ago from All Pro. it is very nice.