Our lavatory design draws on a continuous quality improvement program that solicited responses from major airlines. The result: a comfortable space can significantly reduce costs and reduce weight -- while ensuring you get reliable service on flight after flight. Yokohama is the exclusive supplier of Boeing 757 lavatory modules and the main manufacturer of 737 lavatory modules, having produced more than 11,000 washrooms for the B737 and more than 1,100 commercial vessels for the 757 over the past 20 years. Our lavatory modules and spare parts are fully FAA certified for new manufacturing and retrofitting applications. High performance design. Custom designs and modifications are available.