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