chuck116 said:The yellow is the supply, the tap water. you should be able to go to lowes or home depot and get a y type fitting, like for a garden hose, if your kitchen faucet has threads on it. the blue line is your RO water and the red or orange is your waste water. if the unit is brand new or has new filters you should throw out the first 5 gallons or so . I hope this helps you. If not send me a pm.