Eheim pickup internal filter spray bar
thingiverse
I'm a big fan of my Eheim internal filters, but the outlet nozzle was causing a problem with high current and some "scour" in the sand since it was just a plain hole. So, I removed one of the outlets, measured it carefully, and designed a spray bar replacement that's been working great for me! After version 6, I even got it to fit perfectly.
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