What is this?The hexagonal coupling fittings are components used to connect and extend pipes in the same direction.What will I get?Color: Fitting Shape: Material: Thread Size: Barb Outer Diameter: Overall Size: Package Content: x Barbed CouplerAre there any advantages of the product?Made of durable brass for strength and corrosion resistance. The barbed stems create a tight seal on the flexible and semi-rigid tubes when used with a pipe clamp (NOT Included).How to use it?They can be connected to copper, brass, plastic, and aluminum pipes for the transmission of water, oil, gas, and steam.What should I notice?Please confirm the correct size before ordering.