TAJ ENTERPRISES Corrugated hoses are absolutely leak-tight and are used to convey liquids or gases under pressure or as vacuum lines. They are also referred to as pressure hoses. Their special design achieves both flexibility and pressure resistance. Rubber covered polytetrafluoroethylene or PTFE hoses are used in applications such as transferring acids, solvents, and petroleum products to or from storage containers in industrial plants and are also used for spraying pesticides, fertilizers, and paint.