This OEM Annovi Reverberi water seal kit includes all the necessary parts to repair A.R. 20mm RK and RKA 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:3 x AR840290 High Pressure Packing3 x AR840280 Low Pressure Seal3 x AR961240 O-RingUsed on the following pumps:RK15.28HNRK18.28HNRK18.28HNLRK21.20NLRKA3.5G25NRKA3.5G30NRKA3.5G40HNRKA4G30ANRKA4G30NRKA4G35NRKA4G35NLRKA4G40HNRKA4G40HNLRKA4.5G35HNRKA5.5G30HNRKA6.5G20HNRKA7G20HNRKA3.5G30E-F17RKA3.5G40HE-F17RKA4G20E-F17RKA4G30E-F17RKA4G30HE-F17RKA4.8G30E-F17RKA5.5G13E-F17RKA7G20HE-F17