This is Direct replacement and Non spring loaded CV cartridge. You don't need to use ASI housings.
If you use ACN version (Acetonitrile Compatible), the pumps should not be left idle for an extended period of time with halide containing buffers. Rinse pumps with an alternative halide-free buffer or with pure water.
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Direct Replacement Inlet/Outlet Cartridge, Varian PrepStar SD-1, 200 mL/min.