Algae Free Llc AGF77405 Sure Flow 1600 Upgrade Kit Kit contains everything you need to upgrade the flow rate of your Maxi Jet Power Head Can be mounted with original Maxi Jet mounts or with optional Sure Grip Magnet Mounts It fits all four sizes Kit contains everything you need to upgrade the flow rate of your Maxi Jet Power Head Can be mounted with original Maxi Jet mounts or with optional Sure Grip Magnet Mounts It fits all four sizes Kit contains everything you need to upgrade the flow rate of your Maxi Jet Power Head It fits all four sizes