Video explains rotary shaft seal operating principle
PSS Shaft Seal Type A (Imperial) for Shaft Diameter 2" to 2-3/4" – East Marine Asia
Engine shaft seals | SKF
Amazon.com: Pool / Spa Pump Shaft Seal 5/8" Replacement For PS-200 : Patio, Lawn & Garden
Useful information on pump shaft seals
Radial Shaft Seal Rubber Rotary Shaft Seal 40x62x6mm Replacement Seal for Hydraulic Pump and Motor, BAFSL1SF Type Pressure Mechanical Seal: Amazon.com: Industrial & Scientific