YES........if you look at the picture of my system, the yellow tube is the " in " supply. This yellow tube is connected to a faucet adapter & is attached to the faucet on my slop tub. You will want to be sure that you have around 60/70 PSI. The Ocean Reef system does come with a PSI guage. The system does come with a saddle valve, however sometimes you wont get good PSI when using the saddle valve.