Various embodiments include systems and apparatuses adapted for acoustical insulation. In some embodiments apparatuses include a seal assembly for a conduit, the assembly includes a substantially inflexible collar member sized to form an axial seal around the conduit, the substantially inflexible collar member having a flange extending substantially radially and a substantially flexible axial seal member in sealing contact with the substantially inflexible collar member, the substantially flexible axial seal member including a first portion in sealing contact with a first face of the flange and a second portion in sealing contact with a second face of the flange, wherein the substantially flexible axial seal member and the substantially inflexible collar member maintain the axial seal around the conduit and permit axial movement, translational movement and rotational movement of the conduit relative to a conduit passage panel.