This sock filter kit is designed for use on the inlet side of the Bosch "044" High Output Fuel Pump (Part No. FS FP044, sold separately).
The 31-micron synthetic filter features an integral plastic "skeleton" to prevent it from sucking closed under high fuel draw. The included aluminum adapter has 18x1.5mm male threads to fit the inlet of the 044 pump. This setup is only used when the pump is submerged in the tank. It is not used when the pump is installed outside the tank. Anodizing color on the adapter may vary.
Tip: When assembling the filter to the adapter, place the filter on a solid, flat surface and press straight down on the adapter. Do not attempt to hold the filter with your hand while pressing in the adapter. Failing to properly support the filter may break the filter's internal cage.