Liquid pump unit with latch mechanism

A liquid pump unit, comprising:

• a chassis having a tray box and a chassis box that includes a front opening, a back panel and a bay that is defined by the front opening and the back panel and is configured to receive the tray box, the back panel further including a chassis-outlet coupler, a chassis-inlet coupler and at least one chassis-electrical connector;
• a pump assembly that is mounted on the tray box, having a pump, an outlet coupler, an inlet coupler and at least one electrical connector, where the outlet coupler can be removably connected to the chassis-outlet coupler, the inlet coupler can be removably connected to the chassis-inlet coupler, and the at least one electrical connector can be removably connected to the at least one chassis-electrical connector;
• and
• at least one latch mechanism having a lever, a bar, a latch and a catch-pin that protrudes from the back panel of the chassis box, where the lever is rotatably connected to a first end of the bar, the latch is rotatably connected to a second end of the bar and is configured to engage with the catch-pin and release from the catch-pin through rotation, wherein
• when the latch engages the catch-pin, the at least one latch mechanism is locked in a closed position, and when the latch releases the catch-pin, the at least one latch mechanism moves into a released position.