Make it safe
Identify the pipe material and nominal size.
All guides
Greg’s field guide
Pipe & Fittings
Identify materials and make smarter decisions about repairs and transitions.
09
First, understand the job.
Good plumbing starts with knowing what pipe is in front of you and what connection method belongs there.
Step by step
Do it in this order.
Find the actual problem
Check whether the line carries potable water, waste, gas, or another service.
Make the repair
Use listed transition fittings rather than improvised combinations.
Test your work
Support piping, pressure-test where appropriate, and keep work accessible for inspection.
One last check
Dry everything, run the fixture more than once, and look again in ten minutes. A tiny drip now becomes cabinet damage later.