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To ensure the best fit possible, use pipes and fittings from one manufacturer. Charlotte Pipe and Foundry offers a variety of products for both pressurized and nonpressurized applications.
Pipe and fittings can meet industry standards and still not fit snugly. Fittings made to the high end of the dimensional range joined to a pipe made at the low end of the dimensional range won't fit properly and may leak.
If you've mixed pipes and fittings from different manufacturers, it may not be possible to determine if the pipe or the fitting was at fault if there's a problem. To fit properly, the pipe must be slightly larger than the fitting at the base of the fitting hub. When dry-fitted, the pipe should begin to bottom out 1/3 or 1/2 of the way into the fitting hub.
Charlotte Pipe and Foundry make its pipes and fittings to the same tolerances, meaning everything will fit together properly. The TrueFit System ensures that if you follow basic steps to a no-leak joint, you'll work more efficiently and productively.
Pipes are measured by the inside diameter (ID) of the pipe and not the outside diameter (OD). The approximate inside diameter of the pipe you're using, known as the nominal size, is used to determine the size of the fittings you'll need. A fitting is a part used to join two sections of pipe or other fittings together (examples of fittings are elbows, bushings or couplings). Most fittings are used to change direction of the water flow or stop it altogether. Pressure fittings are used aboveground to connect the pipes that bring water into your home, while DWV (drain / waste / vent) fittings utilize gravity-flow to move water out of your home. The type of fitting you select will help you run the pipes where you need them to go.
For example, if you have a fitting that has a slip socket and you need to put a pipe into it that's smaller than the socket, you'll need a reducer bushing. The reducer bushing will glue into the slip socket, and the pipe will glue into the slip socket in the reducer bushing. For more information, refer to the Pipe Fitting Glossary.