The Civacon LM1161 is a 20 inch full-opening pressure manhole for dry bulk and crude oil applications, rated to 25 psi with an aluminum cover and collar secured by six hold-downs. Beyond tank trailers, it also serves rail car, industrial, intermodal, and bulk container (IBC) use, and is suited to salt, cement, dry food products, sand, chemicals, crude oil, and other general applications.