I just got a Ed's TNT super free flowing gong stem and have only used it 3 times so far:
It is bigger and changes the use of my session type dramatically if I want. It is longer in all sections and a tight fit into the arizer air top. The 14mm joint is the most perfect I have seen. It fits 100% perfect into the 14mm adapters in all my water units. The standard ones (even a few from dhgate) all were not perfectly round conical surfaces. The standard ones I have all wiggle a bit in the adapters, but not this one so I really like that. I have a carb on my water units so this is much welcomed for me.
Even the fit into the air oven top is very tight.....enough that you think it wont fit...so be careful pushing this one in. It will be easier to get it out when heated up to stir or at the end of the session.
The over all length may also help those with the Solo unit to handle when stirring and on/off issues. With the larger area...heat will be dissipated better for grabbing the stem to remove off the vaporizer.
The standard one in the pic has a few cut outs I did with a dremel and composite disk grinder tip. Notice how huge the slots are on the Ed's one....also the load chamber is huge in comparison. This may lead to better convection as the load is farther away from the oven bottom. Also the section the screen (bottom of the load) sits on is not the standard flat bottom with 4 little holes. The load bottom on the Ed's stem are very small pinches like and ice stops in a water unit. So this creates almost no blocking below the load bottom. Id say about 85-90% open flow through the load bottom. Then with the large slots in the tip...you have very very little draw resistance. Using in a water unit I can feel a big difference. It also allows for large loads to do more un-grinded herbs for big tastes hits. I liked that when I tested a session that way.
This gong is a great addition to my Arizer Air having such great taste and production already. Now I just took it to another level......OOOOO YEA...