Description Aladdin Pump Seal AS-163 Pump Seal Fits Pentair Sta-rite LT Pumps Shaft Seal Head Type B Model PS-163 Quality/Material Good – Buna Graphitic Plastic Shaft Size 1/2″ Seal Outside Diameter 1-1/8″dia Seal Height 43/64″ Mating Ring Diameter 1″dia Mating Ring Thickness 5/16″ Same as: Muskin #: 9-2001 Aladdin #: AS-163 Us Seal #: PS-163 Sta-rite #: U109-68SS Note: We may substitute with US Seal PS-163 depending on availability