PART NO. GRD75LJ024AA Guardair 75LJ024AA, Long John, Extended Reach Safety Air Gun, 24 Review August 11, 2018September 27, 2018 - HauntingFish Leave a comment PART NO. GRD75LJ024AA Guardair 75LJ024AA, Long John®, Extended Reach Safety Air Gun, 24. The original extended reach safety air gun with all the power you need, offered in a variety of lengths to meet any application.