What is a special type of supply hose used to draft water from a static source?

The special type of supply hose used to draft water from a static source is known as hard suction hose. This hose is designed specifically to withstand the vacuum created by the pump when drafting water. It typically has a rigid construction to maintain its shape and prevent collapsing under negative pressure, allowing it to efficiently draw water from sources such as ponds, lakes, or fire hydrants.

In contrast, attack hoses are primarily intended for distributing water onto the fire and are not suitable for drafting. A supply line can refer to any hose used to supply water to the fire ground but does not specifically denote a hose designed for drafting purposes. Flexible hoses are usually used in various applications, but like attack hoses, they are not specifically engineered for the negative pressures involved in drafting water from static sources. Thus, hard suction hose is the correct choice given its unique characteristics tailored for that specific function.