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I am using this item with (Aluminum Sand Blaster Long Nozzle Attachment for Walnut Blaster, Sandblasting Wands Attachment 182mm) to walnut blast intake ports on automotive engines. I have high air pressure and after using it for only a few minutes there is an O-ring inside it that gets forced out of place resulting in the blaster not being able to turn off. To solve this all that is necessary is to take the big brass screw out and remove the valve. Under the valve you will find the O-ring has been pushed down into the body. Remove the O-ring...put a small washer into the barrel with a hole large enough for the valve shaft to go through with extra clearance for air to go past. Viola the O-ring can't be pushed out of place. It fits well with our furniture setup.