Swimming pool rail anchor sockets are not overly complicated, however, they have many functions in a proper pool rail installation. 1- The anchor must hold the pool rail securely in the proper location, 2- Must allow essay rail removal for service or seasonal storage, 3- Must connect the rail properly to electrical ground (electrical bonding), 4- Any splashed water must be drained away from the anchor to avoid corrosion and 5- Must function for many years of reliable carefree service. It's critical that anchor socket drain holes are always open and free of debris. This should not only be checked during installation, but annually to assure proper drainage. Improper drainage can cause corrosion which could lead to damage to pool deck and equipment. PERMA-CAST is the choice of professionals.