The threads on my 2640 were messed up. The included threaded piece that is used to mount the barb fitting threaded on all the way but my pvc threaded coupler I had to very carefully and forcefully put on and only got about 4 full turns. I doubt I could remove it I wanted to make sure it would stay on. I would not have attempted to run the pump externally. The pump is quieter than a mag 18.
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