[Size] 1/4 inch male air compressor quick plug to a female 3/4 inch garden hose inner thread and 1/4 inch male quick connecting plug and 3/4 inch male GHT thread; this is standard size and can be applied in most cases. [Material] This RV winterize blowout adapter is made of heavy-duty copper which is durable, withstands high temperatures, and is sturdy and corrosion-resistant. It is not easy to break or deform and can last for a long time. [Application] Winterize blowout adapter is used to winterize garden hoses, sprinkler systems, and faucets by blowing out water from water lines or plumbing to prevent damage from freezing in winter. It helps reduce the use of antifreeze. Convenient, safe, healthy, and environmentally friendly. [Easy to Use] Screw the water lines to the female or male threading side, then connect the quick plug to an air compressor line's female quick coupler. Turn on the air compressor and rotate the ball valve stem to open or close and modulate the air flow velocity to blow out water from the water lines. Product Usage: RV garden water pipe connection Material: Copper Color: Yellow Package Contents: 1 pair x RV Sprinkler Adapter Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement may vary by +/- 1-3 cm.