http://www.bin95.com/Training_Software/Mechanical-Seal-Selection.htm This video was made using our mechanical seal basics training software which covers a large range of seal types like Pusher Seals, Non-Pusher Seals, Cartridge Seals, Split Seals, Double Seals, Tandem Seals, Dry Gas Seals, Spring Seals, Bellow Seals, etc. and provides detailed seal classification. http://www.youtube.com/watch?v=kPfRfMROzgY