AMT® C331-90 1" x 50' Polyester Industrial High Pressure/Fire Hose Assembly, 300 PSI. Designed for high pressure applications such as: fire fighting, fire protection and industrial washdown. Test pressure rating is suitable up to 300 PSI. Construction: Single jacket 100% polyester, ozone resistant tube and black SBR age resistant rubber tube that will not absorb moisture. Aluminum Male x Female NPSH rocker lug couplings.