"Return", as in wet return. The other thread was getting to be way too long.
The experts here noticed pretty quickly that the header drip was connected to the main return drip above the water line, which leads to steam being pushed into both ends of the main loop. And they were right. So my challenge, should I decide to accept it, is to move that connection point from the main drip at "A" to the wet return at "B" in the following pic.
(The woodstove is in the way but will be removed before doing this.)
Here's a pic of the Wet Return, all 2-1/2 feet of it. It and the drips are all 2" pipe.
Here's the end of it, where my plan is to remove the cap, add another tee, drop the header drip into the tee top, and put a ball valve on the end (for cleaning). (If you have a better idea, pls tell).
First question is, how the heck do you screw a tee onto this, so close to the floor?
1950's Bryant boiler in a 1-pipe steam system at 7,000 ft in northern NM, where basements are rare.