fosa 4 Pcs/8 Pcs OD 16mm Tube Fitting, Water Cooling Compression Fitting with Sealing Ringsfor AcrylicTube for Computer Water Cooling System(Black, 4 Pcs)

These are from freezemodz. For the most part trouble free. Every once and a while u get a bad one. Just wish they would state it. For this build I had little concern but don't mix metals in your cooling system.

I used these to water cool my son's CPU, did have or also hard to find a water block for his gpu. Long story short, they did the job, no leaks, just a bit hard to screw on on two of them but once the thread caught on it was fine. Maybe invest in some o rings, but so far it's been fine.

Majority of the fittngs work, there were several that are machined wrong and will not fit the tubbing. Seems like poor quality control.

Set out on a rather large PETG rigid tubing project. Two loops, CPU with an aquacomputer flow meter, 240mm Alphacool 60mm rad, and the visual flow meter on the GPU acrylic plate res (because why not at this point...), and GPU with an aquacomputer flow meter and MOSFET blocks and a 420mm Alphacool res. This was a complete mish mash project... A case not designed for this kind of thing (Corsair 750d airflow, $50 new in box on Craigslist), a tube res with separate pump in one loop and a touchaqua xyz that I got used for next to nothing ($45 with working pump and LEDs) in the other. Complete hardlined and valved drain and fill line for both with an ek two loop double 5.25" res for quick top offs. There are pressure equalization lines for both as well. The number of OD fittings alone I ended up using was staggering. Over 25 approaching 30. I used a majority of this type because...well...using the well known brands would have cost hundreds just in this style fitting alone.Not a single leak from these fittings. Had one of 8 inline temp probes have a bad seal and didn't tighten a plug all the way. That was it. I found the fitment of Bitspower 16mm OD to be ideal while the thermaltake was really tight. Chamfering and using ek PETG tube end inserts with some soapy water, and I had no real trouble. The handful of Bitspower compression fittings gave me far more fits and have a generally less robust grip than these fittings. Each individual fitting came with an extra o-ring as well.They look nice, too. The black with a bit of silver that shows through has a nice aesthetic appeal. There is a lot of thread on these over the tube which I wasn't a fan of before I started installing... But ended up really liking from a rigidity standpoint.Overall, I was thrilled with these. Ordered 6 packs in all from two sellers. Will look for these again for the next customer system hands down.

I have used these Freezemod 16mm fittings, and the Freezemod 14mm hardline fittings as well. They are very easy to work with and produce good results. Don't let the low cost fool you, these fittings perform well and look fantastic. The're quite capable fittings for low profile applications.The tubing used in the photo is Thermaltake 16mm V-Tubler PETG.These fittings use a double gasket internally, and one for the compression ring. Like most hardline compression fittings, the inner orings provide the seal. The outer oring is there to provide stability and rigidity to the joint so the tube does not move. So if you see someone saying its a triple seal, that is not the case here.The number one drawback that I see is that it is sometimes hard to tell when the tubing has bottomed out. If your tubing does not fully engage both inner rings, there will be leaks. Low profile fittings like these don't have room for a 3rd inner gasket seal, but I would generally recommend triple seal +1 compression oring--especially for a novice.

First of all, don't take the negative reviews as anything negative towards the quality of these fittings.These bad reviews are all about getting the wrong size fitting, whether the reviewer themselves ordered the wrong ones by mistake or was sent the wrong size by mistake, I don't know & don't care.The fittings themselves are chrome plated brass, the collars are black anodized aluminum.You can use an Allen wrench to tighten the fitting into the water block, radiator, pump, etc.There are 3 O rings sealing the tube, 2 in the fitting and 1 that goes over the tube and compresses when the outer collar is tightened to secure & seal the tube into the fitting and there is an O ring sealing the fitting to the block.Also the is one spare 16mm O ring in case you need to replace one of the tube seals.They fit very snug on the tube even before the collar is tightened. Once you snug down the outer collar, the tubing is secured and not going anywhere.I'm satisfied with them.

The quality is poor and the fact that the tube can be pulled so easily out of the fittings its a big issue

these fittings are easy to use and look good , the price is affordable which makes doing a water cooled pc build possible considering how many fittings 1 build requires