This is the new, more efficient Extreme Water Separator rated at 2 microns absolute. The reason this new Water Separator no longer has a drain is because the filter element itself traps the water. The new XWS-1002 MUST be used in conjunction with the PF-3001XL. The new filters cannot be used in combination with the old FF-1003 or FS-1001. When replacing the discontinued filters with the new XWS-1002 and PF-3001XL, the XWS-1002 will now be placed on the pressure side of the pump and the PF-3001XL will be placed on the suction side.