MST® AFTER COOLER SYSTEM 1/2" ID 5' HOSE, 3/8" FPT OUTLET WITH COALESING FILTER AND GAUGE ASSEMBLY, 1/12 HP 115/230 VACWORKS WITH MST®, RPB® & BULLARD® AMBIENT AIR PUMPS TO COOL AIR BEING DELIVERED TO THE RESPIRATOR BY UP TO 43%