Aquario Neo Flow Premium Transparent Flexible Inlet/Outlet Pipe with Neo Surface Skimmer and Flow Adjustment Neo Reliever with 2 Pcs Free Neo Holder (L- 17 | Suitable for 16/22 MM Pipe)

I purchased the 16/22 MM size. These pipes fit my Oase biomaster canister filter perfectly and they seem to be unbreakable. They also look very clean in my tank. They're an excellent product and well worth the money, but there are a couple of caveats.First, the packaging does not come with instructions, and since there are a lot of parts, it was a puzzle to figure out how to install them. I ended up having to watch someone's unboxing video on YouTube.Second, the skimmer sucks in my floating plants so I’ll need to figure something out. At least it seems to work well.I’m using an inline diffuser with these pipes so the CO2 is coming out directly from the outlet. I’m still observing to see if the outlet disperses the bubbles throughout the entire aquarium.