First, the characteristics of American throat hoop Throat clamp is a fastener at the connection of soft and hard pipes. Throat hoop solves the existing technology in the throat clamp used for small diameter soft and hard pipe connection will appear dead angle, resulting in liquid and gas leakage Q1, American style hose characteristics Throat clamp is a fastener at the connection of soft and hard pipe. Hose clamp solves the problem of dead angle when the hose clamp is used for the connection of small diameter soft and hard pipes, resulting in liquid and gas leakage