The Campbell Hausfeld VT210400AJ Piston Ring Set is a replacement ring kit designed for Campbell Hausfeld VT-series air compressor pumps that use a 2-3/4 inch bore. It serves as a rebuild component to restore piston sealing and compressor performance when the original rings wear or fail. Sized specifically for the 2.75" bore VT pumps, the VT210400AJ ring kit is listed in Campbell Hausfeld parts catalogs and aftermarket listings as the compatible VT piston ring set for that bore size.
