The chamber includes 3/4” NPT female inlet threads for the 2 - 4" wide, and 1/2" NPT female inlet threads for the 5, 6" wide. Inlet is placed on top, side and rear. Inlets not required can be easily plugged. The re-configurable needle format consists of a plenum chamber and matrix drilled endplate with a hole diameter and profile to accept the individual needle OD including the flared end that locks the needle in place. 2-6" widths are available. System includes needle assembly tool, 6 needles per inch of width, sufficient blanking balls to seal unused matrix holes, and 2 plugs for the chamber inlets.