This is the new TC-4 Revision 2 equipped with a pure copper base and hard anodized aluminum top and O-ring sealed to provide the option of removal for cleaning. Utilizing additional Ribs in the channels with Copper Turbulator coils to greatly increase water to copper surface area, water velocity and turbulance which makes the pumps flow more efficient. The block is made by very tight tolerances with high attention to fit, finish and a perfect O-ring design seal. The block also utilizes black nylon hose barbs. Price includes AMD Socket A mounting kit. P-4 applications include the adapter kit and mounting hardware. Please be sure to select which processor type in the options dropdown.Comes pressure tested, lapped and equipped with black nylon hose barbs in either 1/2" or 3/8".The all metal mounting kit resists stretching with 4-bolts, 4-nuts, 4-springs, 12-nylon washers, and 4-brass knurled nuts for easy tightening and adjustment.