The Sure Stripe 4550 offers the convenience and flexibility of the compact frame used on the model 4050, with the two-spray gun power and legendary durability of Airlessco's SL Slow-Stroker paint pump. The SL pump has a large one-piece stainless steel piston, stainless pump body and check balls. Extra large tungsten carbide reversible seats, along with an externally adjustable triple-life packing system results in reduced maintenance, lower operating costs, and longer equipment life. This pump has the power to spray a wide variety of pavement and athletic field striping paints. An available second gun kit lets you stripe lines up to 24 in. wide. Popular features include a gun mount system that allows you to quickly move guns to any corner of the machine. The front wheel can remain locked for straight lines or be operator released from the handlebars, allowing the front wheel to swivel when painting curves or circles. Inexpensive adjustable turnbuckles provide Radius Memory for consistent striping of arcs and circles even on rough surfaces like sports fields. Wheel locks both rearward to stripe up to walls or forward for maximum wheelbase length for long runs.