Needs ASI Inlet housing 250-1600. If you have not used ASI check valves in the past, then we recommend that you purchase the complete assembly. For better performance, we recommend that you use ASI check valves for both inlet and outlet. This is Non spring loaded CV cartridge and protected with 20 micron filter. 

Because the cartridge contains Stainless Steel, 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.