Five-way fittings, also known as manifold fittings, are used to create a junction in a pipe with five outlets, allowing fluid flow in multiple directions. Determine the required size and orientation of the five-way fitting based on the piping system requirements. Ensure that the pipe ends are clean, smooth, and free from any burrs or debris before installing the fitting. Apply a suitable pipe thread sealant or thread tape on the male pipe threads to create a leak-free seal. Hand-tighten the five-way fitting onto the pipes until snug, and then use a pipe wrench to make a final quarter to a half turn to ensure a secure connection. Avoid over-tightening the fitting, as it may damage the threads or cause leakage. Check for any visible leaks after installation and make necessary adjustments if required. Ensure that the five-way fitting is properly supported and braced to prevent undue stress on the pipes.