Pipe under bathtub drainage leaking water onto floorboards, what do I call this to fix with a(00)

Pipe under bathtub drainage leaking water onto floorboards, what do I call this to fix with a(00)

Image gallery: Bathtub Leaking Underneath

Pipe under bathtub drainage leaking water onto floorboards, what do I call this to fix with a Leaking bathtub into ceiling below? How to fix? DIYnot Forums Bathtub drain leaking : Plumbing