This basic system is a 5-stage system. Stage-1 is a 5 Micron Sediment Filter. Stage-2 & Stage-3 are 10-micron Carbon Block Filters. Stage -4 is a GE/Desal TFC-Dry Membrane. Stage-5 is a GAC inline Post Taste & Odor Filter. The Storage Tank is a 4 Gal. nominal metal pressurized tank. The faucet is a non-air gap, long reach chrome faucet. The feed water hookup assembly valve is a 1/2" threaded inline adapter with a 1/4" port and on/off valve included. This is a complete unit and includes the necessary tubing and fittings for a normal installation.