Mark your pipe with a sharpie. Then measure again. I’m serious—sawing too short is tragedy.
Cut straight. A crooked cut means a crooked joint. Water finds the weak spots. Always.
Use sandpaper to deburr the edges. Little plastic shards are sharp and annoying. Plus, smooth edges seal better.
How To Connect Two Horizontal Drain Pipes at Mary Lockridge blog
The Dry Fit Dance
Before any glue, do a dry fit. Push the pieces together without cement.
See if they slide in snugly. If it’s too tight, sand a little. Too loose? That’s a leak waiting to happen.
Mark alignment with a line. Once cement hits, you have seconds to adjust. No pressure.
