Abstract: A fire and/or liquid seal in a structural wall has a tube-like support extending through the wall with conduits positioned in the support and surrounded by insulation material in the form of silicone foam in one embodiment or packed ceramic fibers in another embodiment with protective shield means being clamped to the support and the conduits on the opposite sides of the wall; in another embodiment a layer of silicone elastomer is provided in a tube-like support extending through the wall adjacent a layer of silicone insulating foam surrounding conduits extending through the support in a penetration seal.