VULCAN-SINCLAIR Fluidrive. Erection, Running and Servicing Instructions for Fluid Coupling Units. Includes several useful sectional drawings. for Fluid Coupling Units. Includes several useful sectional drawings. The manual appears to be a single edition but marked on the cover with a stick-on label for the size 8 h.p.size. Hence, it's more than likely that the manual will apply to all sizes.