Conduit system with expansion coupling and combined spacer and sealing sleeve

Claim 1

A unitary member for insulating, spacing, and sealing expansion couplings between adjacent ends of insulated jacketed tubing which comprises a sleeve member of resilient material having an inner sleeve portion with a reduced diameter bore at one end adapted for directly seating on the tubing of a conduit unit and an enlarged recess for freely surrounding a coupling on the tubing, said reduced diameter bore end portion of the inner sleeve adapted to be squeezed between the coupling and the adjacent insulation of a conduit unit, an outer sleeve surrounding the inner sleeve in spaced relation therefrom and projecting beyond the ends of the inner sleeve, a central body portion uniting the inner and outer sleeves accommodating squeezing of the inner sleeve relative to the outer sleeve, said outer sleeve having open ends projecting beyond the inner sleeve for surrounding the jackets of adjoining conduit units and lip seals around the inner peripheries of the open ends of the outer sleeve adapted to be deflected by the jackets into sealed engagement therewith.