A mechanical seal is a device which helps join systems or mechanisms together by preventing leakage (e.g., in a plumbing system), containing pressure, or excluding contamination. A seal may also be referred to as “packing.”

Seal types:

Induction sealing or cap sealing Adhesive, sealant Bodok seal, a specialized gas sealing washer for medical applications. Bridgman seal, a piston sealing mechanism that creates a high pressure reservoir from a lower pressure source. Bung Coating Compression seal fitting Diaphragm seal Ferrofluidic seal Flange Gasket

Gasket Glass-ceramic-to-metal seals Hose coupling, various types of hose couplings Hermetic seal Hydrostatic seal Hydrodynamic seal Labyrinth seal A seal which creates a tortuous path for the liquid to flow through Lid (container) Rotating face mechanical seal Face seal

O-ring O-ring boss seal Piston ring Plug Radial shaft seal Trap (plumbing) (siphon trap) Stuffing box, Gland (engineering) (mechanical packing) Wiper seal Dry gas seal Exitex seal