JACKETED GASKET
Type of gasket with a metallic cover either partially or completely surrounding a filler material to improve temperature, pressure, chemical and crush resistance.
JOINT
An interstice (crevice) between rigid members of a fluid container.
JUNK RING
A ring added to the bottom of a packing set as either an anti-extrusion ring or as a bushing. See also "Anti-extrusion Ring", and "Wiper Ring".