DIYhz Aluminum Water Cooling Block, 4020012mm Liquid Water Cooler Heat Sink System for PC Computer CPU Graphics Radiator Heatsink Endothermic Head 2PCS

Seem to be solid and will do the job. Time will tell how well they hold up in actual use but working for now.

The parcel took long time to deliver. I'm happy with the quality, but the parcel only contains 1 cooling block instead of 2.

Haven’t had any leaks. I took an x-ray because i wanted to drill and tap two holes to mount a couple of MOSFETs and I didn’t wanna accidentally drill into one of the coolant channels. It turned out the coolant channels inside the block were too narrow for screw size I wanted to use. I used super sticky thermocouple tape instead. I could probably still drill, and when I hit the cooling channel I could immediately stop drilling, tap the hole, and use a very short screw so that the screw doesn’t block the cooling channel, then add some locktite or rtv to the threads, but I did the lazy thing and used the thermal tape, lol

Great little heat sink for the money barbs hold a 5/16 hose without clamps and does not leak. Only down side is the surface finish was not the best had to make the true and polish out the roughness but I have something that a nearly smooth finish is needed. This shouldnt be a problem for your average user.

Used this to make a peltier vased water heater. This works as advertised. No leaking and its solid aluminum save for the plugs but that is a artifact of the machining process.