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. Also included are 2 of the 12" pigtails to connect the regulator to the propane tank or propane supply. Flameking is dedicated to providing world class products that are second to none. Striving to achieve the highest quality, service and value for our customers through out the world with a broad line of advanced and innovative products. Our customer-focused approach has lead the way for Flameking to be seen as the fastest growing company within the industry.