Description:Rocker arms are operated by pushrods from the camshaft, opening and closing valves that allow fuel and air in and exhaust out of the combustion chamber. Cat Reman rocker arms such as part # 20R-5681 are the reliable choice when you need to repair or rebuild your Cat engine.Attributes:• Cat Reman UTN rocker arms are new rocker arms which provide new performance and reliability at fraction-of-new costs.• All Cat Reman products come with a same-as-new Caterpillar Limited Warranty. 1• Cat Reman offers off-the-shelf availability. 21 Warranty can vary by model and application; limitations may apply. For complete details about the applicable Caterpillar Limited Warranty, contact an authorized Cat dealer.2 Part may not be available off-the-shelf at all times and in all locations.