Stacking blocks mount on the center block of Fluidhaus power units for the purpose of adding additional valves to the circuit. The result is a compact system with less hoses and fittings. Each block order (whether 1, 2, 3 or 4) comes with the transition plate and M8x1.25 mounting bolts to mount to the center block. The valves are ordered separately per you requirements.
Each block has an A and B port that is SAE -6 O-ring boss straight thread ports.
The series block can allow free flow through the manifold so there is no heat build up. The series block is typically used with a tandem center "T" spool valve. If adding additional stations they can be a series block but the last block should be a parallel block with an open center "H" spool.