
A dual-reinforced hose combining a steel wire helix with fiber braid: vacuum resistance of a steel-wire hose plus the positive-pressure strength of a braided hose — WP 5–20 / BP 9–60Bar (1:3/1:4 safety factors), 9m water-column vacuum. Sizes 3/4"–8", 10–60m rolls, one hose for both sides of the pump.
The added braid raises positive pressure (to 20Bar) and tensile strength.