256 of the annular tooth 252 is very small to prevent particles from traveling in a radially inward direction i e toward the shaft 22 between the two faces 52 54 as illustrated in fig1 the stator member 202 has an offset portion 270 which surrounds the interface between the faces 52 54 and which thereby increases the effectiveness of the seal device 200 to assemble the seal device 200 the stator member 202 including the cover 244 is expanded to increase the diameter of the radially inner surface 258 of the annular tooth 252 relative to the radially outer surface 260 of the rotor member 204 in a preferred embodiment of the invention the cover 244 is expanded until the diameter of the inner tooth surface 258 is substantially equal to or greater than the diameter of the outer rotor member surface 260 the rotor member 204 can then be easily moved axially into position within the stator member 202 with the annular tooth 252 fitting snugly within the annular notch 250 another seal device 300 constructed in accordance with the present invention is illustrated in fig1 18 the seal device 300 includes a stator member 312 and a rotor member 314 in an assembled condition an o ring 16 is provided between the stator member 212 and the housing 18 and an o ring 20 is provided between the rotor member 314 and the shaft 22 the o rings 16 20 are located within recesses 224 228 similarly to the embodiment illustrated in fig1 15 the ring shaped stator and.