The maintenance-free 7600 series solid aluminum rotary shaft seals by CinchSeal are designed for larger shaft sizes ranging from 3.937” to 6.00”. These seals are ideal for screw conveyors, bucket elevators, and other bulk handling equipment.The 7620 model has a solid clear coat aluminum housing and endplate with solid hard coat anodized aluminum rotor cups and solid PTFE stator plates. The repair kits for the 7620 model are also solid.