Use this flexible 18" grease gun extension hose to access hard-to-reach grease fittings. Highly flexible, durable thermoplastic construction provides a minimum bending radius of 1.57" (40 mm). Fitted with a professional 4-jaw coupler with ball check. Zinc plated steel end connections with hydraulic crimping. Inner diameter of hose is 0.14" (3.6 mm), outer diameter is 0.33" (8.5 mm).