inner and outer seal units 31 and 53 above as best seen in fig5 housing ring 62 is wedged into tapered recess 64 of a collar 66 included within housing ring 62 are opposite elastomeric seals 38 and 40 as above as best seen in fig6 and 7 the various housing rings 32 54 and 62 are formed of hard metal cross sectionally tapered about their annular peripheries 72 o d 72 of the ring includes an annular groove 74 in which to contain an elastomeric resilient and preferably o ring seal 40 optionally one or more of the rings can also include an internal groove 76 about the interior surface 78 for receiving an additional and similar o ring seal 38 it will be appreciated that sealing can be effective with only an inner o ring 38 using a metal to metal seal about the exterior however also using an exterior o ring 40 affords more forgiving of surface imperfections as shown in fig8 and 9 the hard metal drive rings 34 are tapered similarly as the housing rings and include side cuts 80 to permit a controlled collapse in the course of being forced into its receptive recess behind a seal ring the resilient seals 38 40 can be o ring cup seal x ring or other suitable shape that can be assembled into a receptive groove within a housing ring 32 54 and 62 on being forced into an encircling body with a matching taper but having a diameter smaller than that of the housing ring the inside diameter of the housing.