TruNorth Components Air Compressors used in a variety of systems. This is a top end rebuild Kit for them. Service Kit. Kit includes piston cups, cylinder sleeves, head gaskets, cylinder O-rings, & valves only. Used in Sierra Dental Eagle Dental Compressors, Hellenbrand Iron Curtain water filtrations systems, MidMark PowerAir Dental compressors, and MORE. Applies to Models: AOCRR42DQ, AOCRT22D AOCRT22DQ, AOCRS11 AOCRS12, AOCRT21Q, AOCRT21DQ, AOCRT22Q R22, R42, P21, P22, P32 (With Sierra Dental Eagle TruNorth Heads)This is 1 kit to service & rebuild 1 Compressor Head only. Some systems have 2 or 3 compressor heads - in which case you would need to purchase 2 or 3 of these. DOES NOT fit the 2750 Models, Gast, or any other models other than those pictured.DOES NOT include the compressor itself. Have a seized compressor? We have entire replacement compressors available as well! These are an aftermarket kit we manufacture to keep your equipment running like new. If you are having longer tank fill times, low pressure, low vacuum, etc. - your compressor needs to be rebuilt. Easily accomplished with common household tools and takes as little as 10 minutes.After rebuilding these can normally last up to 5,000 -8,000 hours.All items typically ship the same day or day after w/ tracking # uploaded (except weekends and holidays)We are a business and closed Weekends.We also have NEW Pumps in stock - ready to ship - Warranted - check out our store! We have kits for the Thomas 100, 2619, 2639, 2669, 2650, 2660, 2685, 2680, 2750, 1207, 405, 617, 668, 669, 927, 2807, T models ( 617, T-27,30, 30A, 25HD, T-50, T150, T-100/200, T2820, GAST ( most models ), etc.Thousands of kits available - Thousands of NEW Pumps available!