I use the pellet tray as shown in the link...
https://www.amazenproducts.com/SearchResults.asp?Cat=12
A lot of the members are using the new expandable tube and I hear nothing to good results with it and I'm sure some day I'll be buying one for our use. I like the tray after reading on here how some of the members made what they call a mailbox smoker to attach to their smokers. I have a
Masterbuilt 30 so the tray and a mailbox attachment works good for me. With the mailbox, I also do some cold smoking in several 5 gallon (food grade) pails stacked inside each other - I made an attachment to a 55 gallon barrel so with a little charcoal in a pan I can smoke a full run or 15 to 20 pounds of sausages at one time with the mailbox. I can connect this mailbox to my grill and smoke in that so for my use, the tray seems to do the job but I'm sure the expandable tube that Todd has would do the same. I'm not sure of your smoker and how they are used so someone else will pop in to help you I'm sure.
I found that I can control the amount of my smoke by how far I fill each section in the tray. If I only want a small amount of smoke, I'll fill the section half way with Todd's pellets and then make sure I fill the ends so the next section can catch on fire. I would think the the expandable tube would work the same way.
For kicks I tried to smoke some hard boiled eggs in a pail when it was below zero. I purchased several food grade pails and can cold smoke in pails by stacking the half pails on top of one another..
This is my Pail Smoker...
For cold smoking, my tray goes inside my mail box and it attached to the pail or other device.
This was the one (top section) of the pails.
I'm sure others will chime in and be of more help who know your smoker.
I'm sure either one would work for you. You could call Todd and ask him which one would be best.. He'll be more than willing to help you.
John