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Sewer Collection System LegendSewer Collection System Legend Unknown Manhole - Flow Tube Manhole Commercial Service Split Manhole Domestic Service • Flush Inlet Gravity Main • Cleanout Inverted Siphon Bend Force Main Cap Vacuum Main o Coupling F Lift Station • Cross a Pump Station • Saddle C Treatment Plant Sleeve Inspection Manhole Tap Meter Box ai Tee Valve Vault Wye Vault A Gate Valve Casing A Plug Valve - Pig Station El Pressure Clean Out Valve Tank - Air Release Valve Diversion Chamber E Blow Off Valve Lift Station E Vacuum Release Valve ® Pump Station IR Vacuum Cleanout Valve Storage Basin Access Manhole Treatment Plant Structure ® Service Connection Point