The 4HF multipole connection system grants high flow in small dimensions and easy way of expansion by adding new modules (even odd positions). This compact solution is available in two preassembled electrical configurations: 25 pin Sub-D for a max of 22 solenoids and 37 oun Sub-D for a max of 32 solenoids, suitable for 24 V. DC. and 24 V. AC. with led and varistore protection. Every 4HF module grants electrical and pneumatic connection of the system through an electronical board and sealing.