Check the drain and supply alignments before tightening anything.

When reconnecting plumbing after a tub installation, measure and verify every pipe and fitting alignment so nothing is under strain once the unit is secured. Cut and deburr copper or PEX cleanly so joints seat properly and do not create micro leaks; when using PEX, ensure the rings or crimp fittings are fully seated and the tubing is straight for at least one inch into the fitting. For SharkBite style push fittings, push until you feel firm resistance and then pull back slightly to confirm the retention ring engaged, and avoid rotating the tubing once inserted which can damage the seal. Apply thread sealant or plumber tape to all threaded connections on metal fittings and follow the manufacturer’s cure time before testing to prevent early failures. Clamp or support supply lines and the waste assembly so they are not bearing the tub weight or transmitting vibration to the fixture; use cushioned clamps where pipes contact framing. Finally, always perform a pressure test both on the water supply and a water fill test on the drain assembly for at least thirty minutes and inspect every joint before closing walls or finishing the surround.

Common mistakes include relying on a visual fit without testing which lets slow leaks go unnoticed; the fix is to perform a blind pressure test on the cold and hot lines and fill the tub to check the waste stack while observing for drops or seepage. Another frequent issue is over tightening threaded fittings which strips threads or cracks plastic adapters; correct that by hand starting and then using a wrench for only a quarter turn past snug on metal fittings and using the recommended torque for plastic pieces. People also forget to support lines so they shift after the tub is set which stresses joints; add fixed supports and flexible connections at critical points so movement of the tub cannot pull on plumbing.

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