These are threaded PVC ball valves, commonly used in irrigation systems for flow control.Material and Color: They are constructed from gray PVC plastic with red T-handles.Function: These valves control the flow of liquid by rotating the internal ball a quarter turn (90 degrees) to turn the water on or off.Application: They are often used in agricultural settings for drip, sprinkler, and rain hose connections.Sizing: Similar threaded ball valves are typically available in sizes ranging from 20mm to 110mm.