How to customise valve activation direction and position to suit your instincts or match your previous machine setup. Tony explains how to reverse the A and B ports on any valve by swapping the two hose fittings, how to move functions between valves by relocating hoses, and how to cross-ply hoses between the top and bottom valve banks. Important: the hammer valve is the one exception — it is a fixed, one-way pull-to-rise valve and cannot be changed.