[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 with 3/4 inch male GHT thread. This is a standard size and can be applied in most cases. [Material] This RV winterize blowout adapter is made of heavy-duty copper which is durable, sturdy, and corrosion resistant. It can withstand high temperatures and is not prone to breaking or deformation, providing long-term use. [Application] The winterize blowout adapter is used to winterize garden hoses, sprinkler systems, and faucets by blowing out water from water lines or plumbing to prevent freeze-related damage during winter. It helps reduce the need for antifreeze and offers a convenient, safe, healthy, and environmentally friendly solution. [Easy to Use] Screw the water line to the female or male threaded side, then connect the quick plug to the female quick coupler on an air compressor line. Turn on the air compressor and rotate the ball valve stem to open, close, or modulate airflow velocity to blow out water from the 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 display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.