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Explore the extensive selection of Giant brand express tunnel shut-off guns, some of the most durable spray guns available in the market! Giant offers shut-off guns for a wide variety of applications including prep and cleaning in express tunnel washes, pressure washing, self-serve car washes, sewer cleaning, hydro-excavating, food processing, surface prep and more! Giant offers a wide array of gun types including rear load, dump gun and linear designs with flow up to 32 GPM and a pressure ranges up to an astounding 43,500 PSI.