Push in fittings are a popular alternative to traditional fittings and are suited for plumbing systems such as potable water, hydronic heating systems, irrigation, and water heaters. No specialist tools are required and they're much quicker to fit than other fittings. Just push the tube into the fitting to create a strong seal. Male Branch Tee Fittings are ideal for connecting a tube line with a pipe or pipe fitting at a 90 degree angle. They have a male thread on the branch and push in tube fittings on the run.