This OEM Annovi Reverberi check valve kit includes all the necessary parts to repair A.R. RK, RKA, RR, RRA and XRCA series pumps. For a complete list of pumps serviced, see below. If you have any other questions or are unsure if this kit will service your pump, please contact us through eBay. We are a full service pressure washer repair shop and an authorized Annovi Reverberi dealer. Included in the Kit:6 x AR1389051 Complete ValveUsed on the following pumps:RK15.15RK15.20HRK15.28HRK18.20HRK18.28HRK21.20HRKA3.5G22RKA3.5G25RKA3.5G30HRKA3.5G40HRKA4.5G17RKA4.5G25HRKA4.5G30HRKA4G35NLRKA4.5G35HRKA4.5G40HRKA4G20RKA4G30ARKA4G30RKA4G30HRKA4G35HRKA4G40HRKA4G35NLRKA5.5G13RKA5.5G20HRKA5.5G26HRKA5.5G30HRKA6.5G13RKA6.5G20HRKA7G13RKA7G20HRR18.16NRRA5.5G30NRRA3.5G30NRR15.20NRRA4G30NRRA3G30ERRA4G30E