While these rubber adapters may seem overpriced, they do the job well enough. They are used to accept and attach Fluval plastic finned hose to smooth hose and tubing. I used them to attach Glaslily Tubes (17mm) to my Fluval canister filters. I will eventually replace the corrugated tubing with clear vinyl tubing, but I was saving money and didn't want to completely remake the connections. These adapters are medium gray in color as opposed to the connectors that came with my 106 and 406 canisters which were "dusty white". To be honest I think they would look best in black as it is the color of the finned tubing and they would blend in better. They attach perfectly to both ribbed tubing and lily tubing with no extra clamps or anything like that. No leakage and good fit.
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