Specializing in Air Release, Check Valves and Butterfly Valves, Crispin-Multiplex Manufacturing Company has served the international valve industry since 1905. Our products are used in almost every application where water......Specializing in Air Release, Check Valves and Butterfly Valves, Crispin-Multiplex Manufacturing Company has served the international valve industry since 1905. Our products are used in almost every application where water or liquid is moved from one place to another—from pipeworks in the municipal water industry to a wide range of applications across a variety of markets. We look forward to putting over a century of experience to work on your next valve project.