Manifold sub-base NAV-3/4-4C-ISO With port pattern as per DIN ISO 5599/1, for manifold assembly, Connections underneath. Conforms to standard=ISO 5599-1, Product weight=1400 g, Auxiliary pilot Air port 12/14=G1/8, Pneumatic Connection, port 2=G3/4, Pneumatic Connection, port 4=G3/4