Nonferrous
Aluminum pe fitting is typically cast. They are available in all the same forms or shapes as steel fittings. Aluminum threaded fittings such as caps or nipples are available, as are fittings that feature a combination of threaded and butt weld connection styles. Socket weld options also exist. Welding of aluminum fittings usually requires a MIG or TIG process.

Aluminum pipe is also a popular choice for use in creating handrails, and a host of fittings for structural applications are available, both weldable and slip on/clamp-on varieties.

Red brass fittings such as brass pipe nipples are available corresponding to pipe diameters, and these are often assembled by soldering or brazing.

Concrete
Concrete pipe fittings are available in a variety of styles suitable to their application in large civil projects such as storm-water control. Aside from the typical wye connections, specialized fittings include utility hole portals and various styles of vaults. Typical connections use shouldered ends on the fittings which mate with counterparts on the receiving pipes. A rubber gasket provides for a leakproof joint.

Plastics
Plastic pipe fittings are available in both socket weld (sometimes called solvent weld) and threaded styles, with the former the most common. Socket weld fittings are designed to be welded in place chemically, thereby making installation quick and straightforward to complete. Plastic pipes are usually dry fitted, then marked, as the solvent used to connect them is especially fast-acting. Couplings are typically used to connect and join straight lengths of pipe together.

Fittings are available in standard shapes and styles and with the dimensional size ranges of material common to plastic pipe, including PVC, CPVC, PE, PEX, PP, and ABS.

Common PVC pipe fittings include reducers, elbows, caps, tees, wyes, couplings, unions, and crosses, to name a few. The standard cross-sectional profile for most PVC pipe or tubing fittings is circular, but there are other profile shapes available, such as square PVC fittings. However, these alternative fitting profiles are usually associated with PVC pipe that is designated for structural use, such as fences, railings, or furniture grade use, and are not associated with PVC pipe that is fluid handling applications. Besides PVC, other materials may be used for structural fittings, one example being galvanized pipe railing fittings.

Other PVC fittings include barbed insert designs, which are intended to be used with tubing and are pressed into the tubing and secured with band clamps.

CPCV pipe fittings, as well as ABS pipe fittings (Acrylonitrile Butadiene Styrene), also are usually joined with fittings that are solvent welded. Suitable conversion adapters for changing material types, such as from CPVC to brass, are also commonly available.

In some applications using plastic pipe, such as in plumbing for sink drains, certain pipe fixtures such as p-traps may be joined with a threaded connection using nylon washers and a retaining or locking nut. This feature facilitates easy disassembly to clear clogs.

Polyethylene pipe fittings and polypropylene pipe fittings are usually available with both threaded style or barbed style connections, and socket weld or fused options being also available. Similarly, PDVF pipe fittings also are produced with socket or threaded connections.

Where an air or watertight seal is needed, nylon pipe fittings may be employed and can be used with nylon tube or pipe as well as with other types of plastic or metal pipe.

Glass
In some specialized industrial fluid process settings, glass pipe and fittings are employed. Borosilicate glass offers several key advantages over alternative forms of piping systems. The material has high purity, so it will not contaminate process fluids. The natural transparency of glass permits the inspection of the process as needed, while the smooth surface prevents the development of scale or other residues on the interior surface of the pipe.

Laboratory applications may also frequently employ glass tubing and glass profile fittings.

Glass pipe should not be confused with pipes that employ a glass lining, which would be more correctly identified as glass-lined pipe.

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