Dormont Quick-Connect Gas Hoses, also known as quick-disconnect gas hoses, are a mandated purchase for cooking equipment with casters. Dormont quick-connect gas hoses are purchased by the diameter (the connecting inlet is always the same size as the diameter) and also the length of the gas hose. Another feature and most important, is the BTU rating or the amount of gas the hose can deliver to the appliance. As an example, if one has a range with a total gas load of 227,000 BTU, one would need to match or exceed the total BTU. If undersized, there is the potential of starving the appliance, thus rendering it inefficient. Remember, it is not the size of the inlet for the appliance, but the amount of gas the appliance requires. BTU capacities decrease when the length of the connector increases and Dormont has a wide array of gas hoses to fit your needs.