Sundance Spas came out with the Slipstream Filter System. These are the integral components to the system. What comes up missing the most is the Filter Hook Assembly. The hook gets knocked off and many times sucked into the Plumbing to the #1 Jet Pump. Disassembly at the Suction Union on that Pump will usually be where the part has worked its way to. The Filter Pipe Jam Nut was used to snug the filter up to the hook. It is adjustable.