This is how CIPP (Cast-In-Place Pipe) repairs fix underground pipes without digging. A resin-soaked liner is inserted into the damaged pipe, then expanded using air or water pressure so it presses tightly against the inside walls. Once in place, the resin cures and hardens, creating a brand-new pipe inside the old one. No trenches. No pipe removal. Just a seamless structural repair that restores flow and extends pipe life for decades. CIPP pipe repair, cast in place pipe, trenchless pipe repair,