Comparison : Item # L250HDM, 1/4 Inch (in) Heavy Duty Lubricator
Item # L380HDM, 3/8 Inch (in) Heavy Duty Lubricator
Item # L500HDM, 1/2 Inch (in) Heavy Duty Lubricator
Item # L750HDM, 3/4 Inch (in) Heavy Duty Lubricator
Item # L1000HDM, 1 Inch (in) Heavy Duty Lubricator