Grease fittings, otherwise known as Zerk fittings, allow your suspension parts to be greased. They are commonly found on ball joints, tie rod ends, pitman arms, and sway bar bushings. Greasing these fittings regularly helps keep your suspension quiet and working smoothly. Grease fittings can be damaged or stop sealing with age. If these fittings leak, you may notice suspension noise and joint stiffness. Conversely, grease fittings may be plugged and not accept grease. In either case, your grease fittings should be replaced. Some grease fittings are straight or can be angled, and come in a variety of sizes. O'Reilly Auto Parts carries grease fittings in all shapes and sizes for a perfect replacement on your vehicle. We also carry grease guns, grease cartridges, and other tools needed to get the job done.