Installing a bidet attachment is a genuine two-hour weekend project — with the right information. In this episode of Torque & Tape, the full walkthrough: why the seat size measurement comes before the purchase, how the T-valve connects to the tank inlet, why the angle stop valve matters before anything else, how to mount the attachment correctly, what the function test reveals, and the specific mistake — a cracked plastic hose fitting from one quarter-turn of over-tightening — that caused a four-hour slow leak the first time this was done. The lesson costs you nothing here.