PVC tubing can make some excellent airtraps. I have a similar one ... mine is just a little bigger ... about four feet bigger, to be precise. It clears all air in two circulations, or about one minute (I'm moving 5 gallons through around 80-100 ft of tubing for god's sake!).
Wide PVC is highly recommended if you have the space in your case to accomadate it ... or you can go with a football design, like I USED to have on my pimprig. That's a bit ugly, though ....
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#!/bin/sh {who;} {last;} {pause;} {grep;} {touch;} {unzip;} mount /dev/girl -t {wet;} {fsck;} {fsck;} {fsck;} {fsck;} echo yes yes yes {yes;} umount {/dev/girl;zip;} rm -rf {wet.spot;} {sleep;} finger: permission denied
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