Finally it's time to replace the factory tube due to wear and tear. Doesn't look like the original but works. The attachment of the hose to the filter bag adapter is smooth. It's just a bit of a hassle to adapt it to an Emtor device. This tube is made from a fairly thin sheet of plastic with a metal spiral to shape it, so I was afraid it would break when trying to install it on the Emtor block, and then I'd have to look for another solution . . It's not made of durable plastic unlike the old factory part, and the factory part has unfortunately been discontinued. For now it does the job but next time I might just try reinforced PVC tubing for durability.