Triple layer flexible linear anti-spark hose in Polyamide 12, internally reinforced by a PET braid, and externally by a further layer of anti-abrasive Polyurethane 85shA, fire retardant to UL94 V0 standard, suitable for improving protection against sparks and welding slag. The anti-abrasive external sheath (hardness 64 shoreD) can be easily removed with a special tool. Hose suitable for use in quick-connect fittings.