AQUATEK CO2-Proof Tubing 16 Feet

This tubing works exactly as advertised. I've had it installed for a bit now, and there are zero leaks. My regulator keeps my lines around 50 PSI and that seems to hold up just fine. Be sure to cut yours at as close to 90° as you can get it. I used a  Stainless Steel Single Edge Razor Blade  to cut mine. It cut like butter, and left a nice clean edge very close to 90°.I would recommend boiling a mug of water in the microwave, and then holding the end (about the last inch or so) of the tubing in the water for about 30 seconds. The tubing becomes very flexible, and can then be put on very easily. I had no trouble getting this tubing on the  Pollen Glass CO2 Diffuser  after soaking the tubing in hot water, despite the glass stem being quite delicate. Just be sure to take care attaching hot tubing to glass pieces.I'm not sure the exact definition of "Kink-Free Design", but I was definitely able to collapse the tubing on itself, however this was only under a pretty extreme <1" 180° turn. I just used a slight bit more tubing to make the turn a little wider, and had no issues hooking it up to the  AQUATEK 3-in-1 CO2 Diffuser 's line holder, which some buyers of that diffuser seemed to complain about having issues with.In addition to the above two diffusers, I also used it with the following products, and have had zero leaks:-  Fluval CO2 Bubble Counter -  AQUATEK Premium Brass Check Valve -  Pawfly 2-Way Air Valve Distributor

I'm not sure if regular silicone air tubing wouldn't have been just as good for my low-pressure application of adding CO2 to a planted aquarium, but nonetheless I wanted to be sure so I bought this. It works and you get plenty of length in the package.

I purchased this CO2-proof tubing for the CO2 generation system in my 32-gallon planted aquarium. It's VERY hard and rigid, much like RO/DI tubing, and fits VERY securely on my fittings. I placed the tubing tip in hot water for about 15 seconds which helped immensely to get it on to my CO2 fittings. I've had ZERO issues with CO2 leakage. Good stuff!

This tubing does the job but I wish it was more flexible. This might just be something that is common in all CO2 tubing, so I didn't knock any stars for it.

Great tubing. Make sure you heat the tip of the tubing in hot water before you try to use it. But only heat just the amount you need to use, otherwise it becomes even harder to get it over fittings.Really happy with it so far.

The tubing was exactly what I needed for adding CO2 to my aquarium. It does want to stay curled, but if you heat up a pot of water (doesn't have to be boiling) and place the tubing in it for a few seconds, it will easily straighten out.

10 feet was way more than I needed but, means I can do another tank with the rest of the hose. Works well but just a little stiff to work with, that may be good in preventing kinks but harder to string along than regular tube.

I got more than enough tubing for my tank with this. This product is perfect for a black background aquarium, and it seals great. I just held the end of the tube in the crook of my knee for about 2 minutes and it slid right over the join for the CO2 diffuser. It seems to be holding on really good, and I have not noticed any leakage. This is a product that exactly meets my needs.