If your reg is covered by a warranty, then you do NOT pay for service kits when your reg is serviced by an authorized tech every other year. If your reg needs service at a more frequent interval, you still only get free parts every OTHER year, and you will have to pay for additional service kits. This does not include labor, you always have to pay that unless someone is really nice to you. If you are servicing your own reg, you will have to pay for the service kits, that implies that you can buy them somewhere... OF course, your own labor is worth only what your time is worth to you.