The Graco GL-1 X and GL-1 XL high-pressure, heavyduty grease injectors are for use with automatic lubrication systems and are meant for heavy duty applications where higher pressure and output are necessary. The GL-1 X and GL-1 XL injectors offer an adjustable hex-head nut so users can easily adjust the lubricant output. Built as a rugged, single-piece unit, the injectors are manufactured with no vent holes and fully-enclosed press fittings. Designed to meet the needs of each lube point, these systems are well-suited for the harshest operating environments.