01. This HVLP (high volume, low pressure) gun is the industry standard due in part to environmental regulations, but mainly because it allows for better paint control and less wasted product. They generate far less overspray compared to high-pressure siphon-fed guns, but on the flip side they are more expensive. The old siphon-fed type can be identified by the paint feed can attached on the bottom. The type of gun is less important than it being clean and in good working order. Also mandatory is that the gun have a regulator/air-adjuster controller, even if there's a pressure regulator on the compressor. This is because each type of paint requires a different amount of air pressure, and even things like the length of the air hose can affect the air pressure from the compressor. The "high volume” part of the HVLP gun means you need a stout compressor to keep up with demand.