Hydroponic Blackout Hole Cap
thingiverse
This is a hydroponic hole cap designed to block out light from entering a 3 inch diameter PVC pipe. This reduces the growth of algae into the system. Hole size is 48mm. Use this hole saw: https://www.amazon.com/Auniwaig-Bi-Metal-Cutting-Cutter-Plywood/dp/B08SK13Y4R/ref=sr_1_1?crid=2VRC4LV6TF45Q&keywords=48mm+hole+saw+auniwaig&qid=1679421660&sprefix=48mm+hole+saw+auniwaig%2Caps%2C304&sr=8-1
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