WAC 296-863-20035. Make sure liquefied petroleum gas (LPG) fueled PITs meet these requirements

(1) You must use fuel containers that meet either of the following minimum requirements: (a) A U.S. Department of Transportation (USDOT) approved container authorized for LP-gas service that has a minimum service pressure of two hundred forty pounds per square inch gage (psig); or (b) A container Type 250 that has a design pressure of 312.5 psig. (2) You must make sure fuel containers do not use variable liquid-level gages that require venting fuel to the atmosphere. (3) You must make sure the fuel system of PITs used inside buildings: (a) Has an approved automatic shutoff valve, located ahead of the inlet of the gas-air mixer, that will stop the flow of fuel to the mixer if the engine stops; and (b) Use not more than two LP-gas fuel containers. (4) You must make sure the fuel system of PITs used outdoors has an approved automatic shutoff valve, located ahead of the inlet of the gas-air mixer, that will stop the flow of fuel to the mixer if both: (a) The ignition is off ; (b) The engine is not running. Note: You may use an atmospheric type regulator (zero governor) as a shutoff valve if the PIT is used outdoors.