The flexible hoses are used to connect discharge valves with a manifold and to interconnect pneumatic actuation circuits with each valve.Flexible hoses are designed for multiple connection types and lengths depending on the service they should provide within the extinguishing system. Like the other components, the flexible hoses are thought to withstand all difficult industrial environments and therefore their materials have been selected accordingly.In this respect, the hose internal is made of an oil resistant polyamide substrate, reinforced with two aramid fibre braids and one steel braid covered by a micro-perforated polyurethane resistant to abrasion, oil and atmospheric agents.