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I'm not sure if hose clamp will work long term.
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Nope, not a hose clamp. I didn't want a lot of wieght but it needed to be pretty solid so instead of a 1 1/4 muffler clamp, I used a regular U-clamp from Lowe's. It wraps around the pipe to help seal and secure it, and, it clamps on much more than a hose clamp could ever hope to.
I used a pair of "bushings" on the inside of the pipe because I didn't want to cut slits in it. That only allows for exhaust leaks, soot and whatnot. This way, it seals tightly around the first pipe and doesn't weigh a lot or look too clunky. I have to trim the threaded sections of the clamp yet. It squeezes down tight enough on the outer pipe just enough that it seals it and secures it. Again, light, but it works and doesn't look too bad. There are two types of drain pipe. One has a flange where the nut slides over the pipe (which is what I used) and secures it with the flange. The other type would have threads on the area where I've got the clamp, where a pipe would go inside of it and the nut threads onto the pipe in the area where I've got the clamp. To keep it clean, the pipe with the flange is the way to go, IMHO.