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Starting from the faucet:
A. Battery-operated controller turns the water on and off at specified times. This is optional but should be the first component.
B. Backflow preventer protects your household water from accidental contamination.
C. Filter screens out particles that could clog the holes in the drip parts.
D. Pressure regulator reduces the high house pressure to the lower pressure required by drip systems.
E. Adapter connects the 1/2-in. plastic (polyethylene) tubing to the hose threads on the pressure regulator.