A:Answer Hello there! The SH50 replacement heads are compatible with the Philips Norelco Series 5000 and 6000 shavers, as well as the AquaTouch and PowerTouch series. Unfortunately, the Philips Norelco Shaver 2600 is not listed among the compatible models for the SH50 heads. For the Philips Norelco Shaver 2600 series, the compatible replacement heads are the SH30/52. These heads are designed to maintain optimal performance and should be replaced every 12 months to ensure a close and comfortable shave.