The column shut-off valve is designed for use on forms having flat or curved surfaces. Round forms of usually small diameters may require modified base plates. The standard base plates provide multiple mounting holes, as shown in picture. Typical spacing is 8-10 feet maximum between valves. Forms must have sufficient opening at the top to prevent uplift of forms. Maximum rated working pressure of V50CSD is 200psi (14 bar). Consult factory for details and ratings of other sizes.