molding apparatus providing a supply of flowable material to a mold cavity the apparatus having a hot runner system comprising a sealing member located between two manifolds that concentrates the sealing pressure adjacent the melt channels application_number US 91196001 A description referring first to fig1 and 2 a hot runner subsystem in accordance with the present invention is generally shown a sealing member 10 having a top surface 12 a and a bottom surface 12 b is inserted in a recess 11 of a sub manifold 44 a melt duct 14 in sealing member 10 is aligned with a first melt channel 48 and second melt channel 46 located in a bridge manifold 50 and sub manifold 44 respectively bridge manifold 50 is located in a manifold cavity 53 formed in backing plate 30 a plunger 51 preferably comprised of a plunger bushing 52 and a spring means 54 is located in pocket 64 and maintains a gap between bridge manifold 50 and backing plate 30 to reduce thermal communication therebetween in the preferred embodiment the spring means 54 is comprised of a series of stacked belleville springs to create a resilient spacer to adjust to thermal expansion of the various components the spring means 54 can also be selected from the group consisting of a compression spring and a resilient material a plurality of fasteners 55 rigidly affixes a manifold plate 32 to backing plate 30 sub manifold 44 is located in a cavity 57 formed in manifold plate 32 a spacer 56 is located between sub manifold 44 and backing plate 30 to reduce thermal.