1/8” BSP Thread (widely used throughout Australia) Working Pressure 4500PSI RYCO QUALITY R4100 FLExIbLE GREASE GUN ExTENSIONS recommended for: Rubber-covered hose for high pressure greasing andlubrication systems.Tube: Black, oil resistant seamless synthetic rubber.reinforcemenT: One braid of high tensile steel wire.cover: Black, oil and abrasion resistant synthetic rubber.feaTures: Suit standard grease guns.High tensile wire reinforcement for high pressureand durability.