The item didn't arrive. The seller registered a wrong tracking number in the system (item from another address). I opened a dispute with a reason "Wrong address" and the seller accepted it without arguing.
flask is 19/26, not 24/29 flask came with cracks on the neck, and it does not seem caused by delivery, beleieve sent cracked, looks like returned flask or something. 19 is much smaller than 26, considering 2 pipes inside, as for the steam flow it does not work as perfect as wider neck could. it really function only if You wrap pipes with foil, otherwise it never heat up whole construction enough. as for the rest of the glassware, it does not have any marks (i.e. numbers on the connectors, brands or glass type) has bubbles inside of the glass, but overall it did survive heating >200C and cold water<8C. two runs of 10 hours each. --- initial tracking number provided was fake - it shown up as picked up by someone in different city. when problem was escalated, item was finally sent with a new number , but Instead of Aliexpress Standard Shipping to the pickup point address, item was sent by snail post to the Aliepxress pickup point, which is not possible to deliver