Brand new - no box The Auto-Changeover LP Regulator allows you to hook up 2 Propane tanks and the regulator automatically switches over to the second tank once the first one runs out (and vice versa). The indicator changes color to let you know when a tank has been depleted and needs to be refilled. The inlet is a 1/4" SAE inverted flare and the outlet is a 3/8" NPT female pipe thread. 262,500 BTU's Per Hour Capacity. Set at standard propane low pressure - 11" Water Column. Regulator body is 6 1/4" Overall Height. Will replace any existing automatic changeover regulator on your current RV, Travel Trailer, Pop Up Camper or 5th Wheel. Adjustable gas pressure. Also has a pressure tap. The Auto-Changeover LP Regulator allows you to hook up 2 Propane tanks - the regulator will automatically switch over to the second tank once the first one runs out. The indicator changes color to let you know when a tank has been depleted and needs to be refilled. Flipping the supply lever to face the other tank will reset the indicator and allow you to remove the empty tank to take it to be refilled. Durable and easy to use. Dual stage design maintains constant gas pressure under changing demand and conditions