I've had the Merlin MTL for a while now, and its a no go for me. IMHO it is NOT a MtL
tank. It is a good restricted DL, but not a real MTL. Also, every time I used it, it would weep. After a tank full there would be a ring of droplets around the base of the tank and it seemed to always be sticky. Cleaned it, and put it back in the box. Got it cheap, so at least it was a cheap mistake for me. BTW, I used the smallest insert.