The FASS Extreme Water Separator removes over 99% of the water found in diesel fuel (3rd party verified), and is rated @ 2 microns absolute. The reason our water separator no longer features a drain, is that the water is trapped by the element itself! This XWS3002 MUST be used in conjunction with the PF3001—the new filters cannot be used in combination with the FF-3003/FF-3010 or FS-1001/FS-1020 When replacing the discontinued filters with the new XWS3002 and PF3001, the XWS3002 will now be placed on the pressure side of the pump and the PF3001 will be placed on the suction side. Please Note: See the location diagram on the new filters for proper filter placement!