Drain pipes carry wastewater away from sinks, tubs, showers, and appliances. When they age, the signs show up as slow drains, gurgling, and occasional backups at the lowest fixtures in the house. Replacement usually targets the failing runs rather than the full drain network, though older homes with cast iron drains often benefit from a full drain-waste-vent upgrade at once.

Sewer lines are the single run that carries every drain in the house out to the municipal line or septic. When a sewer line fails, the whole house loses drainage. Princeton Air runs a camera inspection before any scope is committed and uses trenchless methods where conditions allow, minimizing the disruption to the yard and the driveway.

Water supply lines carry pressurized water from the main to every fixture in the house. Failure shows up as leaks, pressure drops, discolored water, or visible corrosion on exposed runs. Older homes built with galvanized supply lines typically need the full supply network replaced, while homes with copper or PEX usually need targeted replacement of specific failing runs.

Gas lines carry natural gas or propane to water heaters, furnaces, ranges, and dryers. A gas line showing its age gets replaced as part of a larger plumbing project or as a standalone safety project. Every gas line Princeton Air replaces is pressure-tested and inspected per local code before being put back into service.

The right pipe material depends on what the line carries, where it runs, and what the rest of the house plumbing already uses. Princeton Air works with PEX for supply lines in most modern repipes, copper where the run is exposed or the application calls for it, CPVC where hot-water-rated plastic is the right fit, and PVC for drain, waste, and vent work. In homes with galvanized or polybutylene supply lines, the priority is usually removing them entirely and replacing with modern material, since those older systems are known to fail progressively.