Fluid exchanger

A fluid exchanger comprising:

• a first tank connected to a first hose;
• a second container connected to a second hose;
• and
• a nozzle comprising:
• a first hose port;
• a second hose port;
• a valve housing that comprises a valve and that is connected to the first hose port and to the second hose port, the valve having at least a first configuration and a second configuration;
• an insert tube coupled to the valve housing and fluidly connected to the first tank when the valve is in the first configuration and fluidly connected to the second tank when the valve is in the second configuration;
• and
• a reservoir connector coupled to the valve housing and to the insert tube, wherein:
• the insert tube includes a first segment extending between the valve housing and the reservoir connector and a second segment extending from the reservoir connector to a terminal end of the insert tube;
• the insert tube is slidably coupled to the reservoir connector to adjust a length of the second segment;
• and
• at least a portion of the first segment is constructed of a transparent material.