Check the listing for details. Respironics Millennium Thomas Compressor Cup Seal o2 Concentrator Repair Part. Condition: New. Listed at 52.99 USD. NEW Replacement Cup Seal ONLY *picture 1* for the TOP End on the Thomas Respironics Millennium Single Piston 607CE72 Compressors shown in picture 2. Used in the M600, M605, 600, 605, 600L, 605L models. This listing is for 1 Replacement Cup Seal ONLY - Does not include the compressor or any other parts or pieces.We have the rebuild kit available with the sleeve, or the rebuild kit with valves, sleeve, gaskets, etc. - JUST ask.Respironics Millennium 600 605 Compressor Rebuild Kit – Millennium 5 LPM. 600L, 605L, M600, M605, Thomas 607CE72. Thomas compressor Model NO: 650735. 1017900, K48ZZXZH3250.Pictures are for representation only - actual items may vary in shape, size, color, etc.After rebuilding these will normally last up to 5,000 hours before the cup seal needs to be replaced again!All items ship same day or day after w/ tracking # uploaded ( except weekends and holidays )We are a business and closed Weekends.WE stock ALL rebuild kits for pretty much the entire line of Thomas, Matala, Kasco, TeichAir, Medo, KLC, HiBlow, Gast, and many others!! --- IF you have one needing a rebuild and cannot find a kit just ask us - chances are its in stock! or we can rebuild it for you. 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.WE have spare parts - fan blades, bearings, piston rods, plates, caps, screws, flappers, restrainers, gaskets, motor mounts, filters, silencers, hose clamps, tubing.... and many more!Thousands of kits available. Return policy: Returns will be excepted ONLY if item is returned unopened and unused! Please know what you are buying and that it is the right size, model number, kit, etc. If you have any questions about the item please email us and ask before purchasing. Return shipping paid for by buyer unless other arrangements are made. Thank You