This OEM GM diesel exhaust fluid pump, part number 84412924, is a reservoir kit for select Chevrolet and GMC trucks -- namely, those with diesel V8 engines from between model years 2012 and 2016. For example, it's compatible with the 2013 GMC Sierra 2500 HD and 3500 HD, in WT, SLE, SLT, and Denali trims, as well as the 2014 Chevy Silverado 2500 HD and 3500 HD, in WT, LT, and LTZ trims. It's also designed for use in the base trim of both the 2015 GMC Sierra 2500 HD and its 3500 HD sibling. It replaces original DEF pumps with the following factory GM part numbers: 22872118, 22902620, and 23379348. Notes: 6.6-liter diesel 2015-2016 emission reduction system.