U.S. Seal PS-3865 Seal Assembly Ozone / SaltU. S. Seal PS 3865 Shaft Seal Assembly The U. S. Seal PS 3865 is designed for pools and hot tubs that are using Salt Generators or Ozonators. These applications require tough seals due to there more corrosive nature. Description: 5 8" Shaft Viton Graphitic Plastic SS with Polished Ceramic Seat Industry Standard for Pool and Spa Applications with Salt Generators and Ozone Generators Also Replaces: U. S. Seal VG 1000 Value U. S. Seal PS 1000 Premium U.