These vinyl caps are designed to keep your air chucks and couplers clean! Let's face it, tires get dirty. In order to work on dirty things a MORRFlate has to get dirty. Over time dirt, sand, mud, and grime will get into ANY air chuck while offroading. Help your MORRFlate's air chucks last longer between cleanings with these caps. You can also use them to help keep any air couplers clean too! **One purchase gets you a set of 4 caps