These manifolds are designed to connect two cylinders. The check keeps the two tanks equalized and allows each tank to be changed without disrupting the ow of propane to appliances or dispensing large amounts of LP-Gas into the atmosphere from the other tank. When changing out a tank, simply close the tank valve and disconnect. The check will automatically move to the closed tank valve side to seal off the inlet of that tank allowing minimal LP-Gas discharge into the atmosphere. |Primary uses are for mobile homes, single appliances, recreational vehicles or summer cottages|Nut size: 1-1/8 in. |Inlet: female POL (2)|Outlet: male hard nose pol

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