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The Wagner Paint Crew airless sprayer does not require oil for its operation like full professional sprayers. The piston is off-set from the pump chamber with the inlet and outlet valves opposite each other, however you need to protect the parts from corrosion between use and Wagner recommend running some light oil through it after cleaning. If you will be using it in a day or so for water based paint, you could run a 10% solution of their EasyGlide through it.
All airless sprayers are on-demand pumps. The two settings are prime and spray. When it is set to prime, the pump will draw liquid from the bucket below and pump it out the side tube and will never stop until you switch it back to spray. When set to spray, the pump will run until the pre-set pressure is reached, then stop. As soon as you start spraying, the pump will run until a few seconds after you stop spraying. Tip size and pressure setting will affect how long after you stop spraying the pump will run. A large tip and high pressure will cause the pump to run longer after you stop spraying.
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