OLD STYLE CAP SHOWN ABOVE IN WHITE
Replacement Constant Pressure Cap for Bio-Green and EZ Flo Fertilizer Injection Systems. If your tank has a grey fine thread nipple installed in tank (2004 and earlier) thus is the correct cap. Newer EZ FLo Units have a large Buttress thread molded into the tank and should order a new style cap here. Old cap may be green or white.