Removable circular nozzle for flow cytometers

A flow cytometer or cell sorter system, the system comprising:

• a flow cell coupled in communication with a fluidics system to receive a sheath fluid, wherein a sample fluid flows with cells or particles through the flow cell to be surrounded by the sheath fluid, the flow cell including
• a flow cell body coupled around a drop drive assembly to receive a fluid stream of the sample fluid from a sample injection tube;
• a cuvette coupled to a base of the flow cell body, the cuvette having a pocket and a cylindrical flow channel to receive the fluid stream of the sample fluid;
• a receptacle coupled to the cuvette within the pocket by an adhesive, wherein the receptacle has a body with a through-hole having a tapered conical portion;
• and
• a circular nozzle assembly selectively engageable with the receptacle and the cuvette, the circular nozzle assembly having a nozzle body with a center flow channel and an o-ring gasket coupled to a top surface around the center flow channel, wherein the nozzle body has an upper tapered conical portion to engage with the tapered conical portion of the through-hole in the receptacle to align together the cylindrical flow channel of the cuvette and the center flow channel of the nozzle body.