This kit protects pump and membrane from excessive exposure to silt and other suspended particulates. It should be used in places such as glacier bays, inland waterways, brackish waters, or shallow waters where the bottom may be agitated. The kit contains 1 amp 12v booster pump, 2.5 micron pre filters, and all fittings. This kit fits the Power Survivor 40E but is also compatible with older models such as the Power Survivor 80E and Power Survivor 160E.