I bought this for an aquarium installation project and it worked great. They fit 1/2" diameter PVC pipe and fit easily into a coupling (e.g. plain elbow or plain tee etc.). The item received was exactly as pictured. Will update when they are present but I don't suspect there will be any performance issues, I don't plan on gluing them in place so I can remove and flush them when they start to clog.
Aquael Fan Filter Mikro Plus
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