PolarFlo TT Chipset Block Review
"There are 3 pieces; the base, cover, and mounting ring. Simply put, the base and cover screw together and the mounting ring sits between them along with an O-ring for seal. With this design, you have the ability to purchase a new base from PolarFlo when the next generation blocks are released. If you upgrade in another year from the Intel 875P motherboard to a K8T800 or Intel 925X and need a new mounting ring, simply order it from PolarFlo. And if PolarFLO has a new and improved copper base, order that too and replace the old one."