pressure is advanced through a wiping die in a constricted passageway and into another chamber into which similar compound is pumped the compound in the second chamber is at a substantially lower temperature than the compound in the filling chamber and exerts pressure radially on the cable core being filled to form a sheath or coating of the lower temperature compound around the filled core to seal the first compound in the core the core is thereafter passed through a sizing die into a cooling chamber which solidifies the compound in and around the core the cable core is thus conditioned for the subsequent application of sheathing materials thereto for example core wrapping and or armor sheathing application_number US 61502275 A description referring to fig1 there is shown an apparatus 10 for injecting and sealing a waterproofing compound into and around the interstices of a cable core 11 passed therethrough longitudinally the apparatus 10 preferably includes a lead in tube 12 connected to one or more vacuum chambers 13 through a constrictor section or die 16 where the interstitial voids in the core 11 are substantially evacuated the core 11 is thereafter passed through a die 17 and a pressure gradient or insulated cooling chamber 18 which may have a cooling medium for example water circulated threraround through an inlet 21 and an outlet 22 under some operating conditions it may be found desirable to circulate a heating medium instead after the pressure gradient chamber 18 the core 11.