An in-line, hose-end filter/flow regulator/anti-siphon device is disclosed. The disclosed hose-end device includes a unitary body having a generally linear side profile, a first end, a second end, and a longitudinal axis. An inlet hose-end receptor is disposed on the first end, while an outlet hose-end receptor is disposed on the second end. An anti-siphon section, a filter section, and a flow regulator section are positioned between the first end and the second end. The inlet hose-end receptor, the anti-siphon section, the filter section, the flow regulator section, and the outlet hose-end receptor are coaxial with the longitudinal axis of the body.