The AR2546 Piston kit is the Original Equipment AR replacement valve kit.This AR2546 Piston kit consist of the following parts:3 x AR1380940 Ceramic Piston
3 x AR962010 Nut
3 x AR962000 Washer
3 x AR1380950 Spacer
3 x AR600180 O-Ring
3 x AR1080401 Back-upring
The AR2546 was used on the Annovi Reverberi RK, RKA, RKV, XRCA, XRV, XRCV, series pressure washer pumps also known as AR pumps.