QUICK COUPLER KEY: The Underhill QK-100 Quick Coupler Key provides easy water access for your hose. An essential garden tool for safety and peace of mind. From a trusted USA-based company. COMPATIBILITY: Compatible with Rain Bird, compatible with Toro, compatible with Hunter, and compatible with Buckner for maximum performance and seamless garden irrigation. 1-Inch MPT x 3/4-Inch FPT Outlet. DURABLE: Works with both one piece and two piece quick couplers. Made from solid red brass with a stainless steel single lug on all models for enhanced durability. HEAVY-DUTY: Underhill provides garden hose accessories that are quick and easy to install. The Quick Coupler Key features heavy-duty galvanized handles for simple operation. PROFESSIONAL QUALITY: Our commercial-grade Quick Coupler Water Key is ideal for professional irrigation specialists or home gardeners.