Ordering Description Product number Description: Tweco PMW64-45 Conductor Tube (45 DEG) Metal, Water Cooled, PulseMaster 400 & 500 Product number: 1644-2925 Description: Tweco PMA64EL-45 Conductor Tube (45 DEG) Metal, Air Cooled, PulseMaster 350 & 450 Product number: 1642-1130