REPLACEMENT HP CAP - BUTTRESS THREAD
Replacement cap for Bio-Green and EZ Flo Injection. Models manufacturered after 2004 have buttress threads molded into the tank and use this cap. Tanks manufacturered 2004 and earlier as BIOGREEN had a grey fine thread nipple installed in the tank and should order an old style cap here. Constant Pressure Caps are white. Includes Cap and Dip Tubes.