Aquarium Accessories 5 pcs of U Type Tubes air Pump Accessories co2 System U-Shape Connector

Very good engineering. However, if your aquarium has a rim, this really isn't for you. You CAN use it in some cases but you'll have to carve out notches in your rim to make it work. If you have a rimless aquarium, I recommend this without reservation. If you have an aquarium with a rim, I'd suggest you pass; it isn't worth the permanent modifications to your aquarium that you will have to make.

Works great for DIY tops for fish tanks. Will never get smushed or bent and lose air flow. I had two airlines bend on me so I decided to give this a try. Glad I did! I bought 2 more 5 packs to change all my airlines in my tanks. Couldn't be easier to do. Cut the airline where you want make the bend and plug and play! So far the initial batch i bought back mid September have been working fine. Definitely a 5 star product if you're willing to spend 3 bucks a pop on these.Edit: 11/26/2018I should also add that these are a really snug fit on my rimmed Aqueon tanks I purchased from Petco for the 1 dollar a gallon sale. They take some effort to get on but they still work fine.

Makes my CO2 line look much neater. This is made for rimless tanks, but it will just fit over the rim of a 10 gallon tank. The barbs are a good size and the CO2 line is snug and not leaking any gas. I just got these and will update this if there are any long-term issues with corrosion.

I got these for my two dosing pumps to hang over the rim of my aquarium. These work well. These are a slightly larger gauge than standard airline tubing, but I was able to get them to fit with a little effort. I'm pleased with my purchase.

These are freakin' awesome and well worth the price. They are heavier than expected, easy to install just lubricate both sides with a tad bit of your tank water first an then they slide right into your air tubing without a hassle, and they are amazing quality. Highly Recommend and I would 100% buy more if I should so need them

Its only a little more than a quarter inch inside the hook loop area will not fit any tank only a pane of glass

They work great for cleaning up my airline arrangement. You'll need to do a little trimming if your tank has a lip. Standard airlines will require some negotiating to get them on too.

Unfortunately it will not fit over the top edge of my fish tank. :(