Drainage junctions are engineered for flow: branches enter obliquely so incoming discharge sweeps downstream rather than colliding with the main flow. Square (90-degree) connections cause turbulence and snag points, which is why standards restrict them.
Junctions are natural inspection landmarks on camera surveys and the points that must be reinstated after a drain is relined.
Merges branch drains into main runs with minimal turbulence.
Wherever fixtures and branch lines join the main house drain.
A CCTV drain inspection is the standard way to confirm whether this is what's happening in your pipes: the camera shows the condition on screen, a locator pinpoints the exact position and depth, and you get a recorded report before any repair decisions are made.
A CCTV drain inspection shows exactly what's happening inside your pipes — no guesswork.