Underhill QK-100 Quick Coupler Key – Brass, 1″ MPT x 3/4″ FPT

The **Underhill QK-100 Quick Coupler Key** is the essential tool for effortless water access in your sprinkler or garden irrigation system. Designed for both professionals and DIY gardeners, this heavy-duty key ensures quick, secure connections to **Rain Bird, Toro, Hunter, and Buckner** quick couplers—compatible with both one-piece and two-piece designs. Crafted from **solid red brass** with a **stainless steel lug**, it delivers long-lasting durability even in demanding outdoor conditions. The galvanized handle provides a firm grip for easy operation, while its **1-inch MPT x 3/4-inch FPT outlet** ensures a precise, leak-free fit.

Trusted by irrigation specialists nationwide, the Underhill QK-100 is built to withstand frequent use, making it a must-have for maintaining efficient water flow in your irrigation system. Whether you're servicing residential sprinklers or large-scale garden setups, this **commercial-grade tool** combines reliability with simplicity—no more struggling with stubborn couplers. Backed by a USA-based manufacturer, it’s the go-to solution for hassle-free irrigation maintenance.