Note: The new and improved Lightning 45 bottle valve can be identified by the machined flats around the 1/8' NPT gauge ports. The new 'Lightning 45' valve also has a smoother hand wheel for a better feel when opening. The new 'Lightning 45' bottle valve features a female -06AN O-ring discharge port in the valve body. For -04AN feedlines use nipple p/n 744-11721. For -06AN feedlines use nipple p/n 744-11722. For -08AN feedlines use nipple p/n 744-11723.