A few different types of power inserters are available for the DIRECTV SWM-8. We recommend the DIRECTV-brand power inserter in any situation where you are installing only one SWM-8 unit. This is generally labelled PI-28, although is generally delivers 29 volts of power. A newer revision is now called the PI-29. The PI-28 and PI-29 can also power a SWM16, or a SWM LNB.