Rheem Rinnai Tankless water heater screen filter assembly wrench
thingiverse
This worked on my Rinnai tankless water heater. I think it will work for Rheem, but I'm not sure (someone please correct this if I'm wrong). Someone had screwed it on too tightly. DO NOT OVERTIGHTEN! This wrench can put way more torque into that little plastic part than necessary. I drilled a hole, put a string through it, and hung it on my heater so it'll be there when I need it. I printed out of PETG with a .6mm nozzle and 40% infill, but hopefully none of that really matters to you.
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