10 Pcs Black G 1/4 PC Water Cooling Plug Fittings with O- Ring Stop Fitting for Computer Water Cooling System

Fittings had no imperfections, felt high quality and were great value, they also did not allow any water to leak out of the loop.

My Pic is of the top of my EK reservoir. You'll notice that I have the stock nickel plugs on top and the front side. If you look closely, you'll see that the top plugs are slightly recessed into the top itself where the front plugs are not. In those recessed ports which only exist on the top of EK reservoirs, are just about the only place these new black plugs won't fit. The head on them are to wide to go down in the recessed cutout so they will not seal. Other than that, they work great for my EK GPU waterblock and elsewhere in the loop. I was really hoping to get rid of all of the nickel colored stock EK plugs. I suppose I could add an extra o-ring or two to the top plugs in an effort to make contact with the recessed area better. This of course is not the fault of the plug design. It's just EK being EK and making custom stuff so you buy from them for accessories. These are actually really good quality of the price. They have a nice smooth black finish and are pretty beefy. They don't feel cheap at all.

I only needed a few but it's nice to have extras for later down the road. It seals my reservoir even upside down.

Got these because I somehow never have enough water block seals. I do sell my used blocks on occasion, and I usually include these once I sell them. They only need to last long enough to get to the customer, and they work fine for that. The fitment is good, seal is good. Price is great for how many you get. Quality is pretty good, I have no complaints.

Does what its supose too plugged my hole with zero leakage. I used one as a vent plug and it has not leaked after several remove and installs. Kurrled knob makes easy install never need to use a screwdriver.

These are metal with a ridged edge so they are easy to get a hold of to open and close. They have a nice notch through the middle so you could use a screw driver if you wanted, but I was able to hand tighten easily. they have an o-ring which makes a great seal. I'm glad I got the 10 pack. I replaced the plastic plugs that came with my D5 pump. I would buy these again.

Plastic plugs can fail over time. Replace 'em with these.

Perfect