Built to resist Being a public escalator, for both indoor and outdoor use, the Otis 513 MPE has been conceived to withstand the most punishing treatment. The build has been made especially sturdy and the materials used especially robust. In short, the Otis 513 MPE is vandal-resistant. Developed to withstand extremes of weather as well as to cope with particularly heavy traffic, the Otis 513 MPE has established an unsurpassed reputation for reliability.