Double Jacket Fire Hose 1" USA Made fire hose is manufactured to NFPA 1961 specs and is suitable for water pressures up to 400 psi. We also stock a 1" lay-flat double jacketed hose with garden hose threads suitable for up to 150 psi. The double jacket hose category is our most durable hose and fire hose with color treatment offers the absolute maximum durability. Please select the correct thread type (NH aka NST or NPSH or GHT) for your connection.