Prolube flexible grease hose 12 inch (Gf6231). grease hoses allow greasing access to nipples with limited REACH. Due to their flexible construction, these are used for greasing hard to REACH grease fittings thermoplastic construction with 0.14 inch (3.6 mm) inner diameter & 0.33 inch (8.5 mm) outer diameter highly flexible with minimum bending radius of 1.57 inch (40 mm) zinc plated steel end connections with hydraulic crimping available in the following variations: hose fitted with heavy-duty spring guard, hose fitted with professional 4 jaw coupler with ball check, or hose fitted with swivel.