While the original intention was to prevent Water Ingress, these connectors also seal out many other fluids such as automotive liquids and cleaning solutions as might be used in food processing. Replacing the common steel shells, CONEC uses brass components, and for really harsh environments, stainless steel shells. Since CONEC can seal just about any D-sub, regardless of size, contact density, or termination, this is the broadest line of Sealed D-subs anywhere.