The 1/2" MNPT x 1/2" FNPT Brass Swivel can be used in certain systems. As a Spraying Systems/TeeJet product, it may be best to use this piece in systems from the same manufacturer. Because of the swivel fitting, part of the system is able to rotate horizontally or vertically. The swivel can be used to transport liquids. The high-quality production may help extend the life of your hose as well as the rest of the sprayer system.