US Patent Design 562,661 :
WARNING: This product is designed for compressed air systems only. Do not use this blow gun on air lines that are not regulated. Only for use on air lines with a maximum 110 psi. This gun has a safety tip with side relief holes to prevent tip pressure exceeding 30 psi when dead-ended, conforming to OSHA regulations. Do not modify or alter the gun or the gun tip. Use correct size male-threaded adapter (1/4 in. NPT). Make sure gun is securely tightened to the adapter. Do not re-tap or modify the threads for a nonstandard adapter. Please note that personal protective equipment and/or chip guards may be required for your specific application. Use of products contrary to directions, specifications, or these limitations may result in personal injury and/or property damage.