How hard is installation?

Across retailer reviews for every attachment in this roundup, installation is the single most-praised attribute — most users report 15–30 minutes with no plumber required. Electronic seats add a power cord and sometimes a T-valve step but are still rated as DIY-friendly. The most common install complaint across all models is the cheap plastic T-adapter that ships in the box; some buyers replace it with a metal version or an inline shutoff valve.