Cat Reman valve lifters, or tappets, such as part # 20R-1828 follow an engine’s camshaft lobes to open and close intake and exhaust valves. Attributes: • Cat Reman valve lifters are new lifter (tappet) assemblies which provide like new performance and reliability at fraction-of-new cost. • All Cat Reman products come with a same-as-new Caterpillar Limited Warranty. 1 • Cat Reman offers off-the-shelf availability. 2 1 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.