This EH series is interchangeable with the RE577560 John Deere SCV Breakaway Quick Coupler. Steel Product. This durable coupler is engineered for long-term performance. Its fully serviceable design can be easily rebuilt, extending its service life and reducing downtime. To ensure exceptional corrosion resistance, it undergoes and passes a rigorous 200-hour salt spray test—a standard that translates to a projected 10-20 years of reliable operation in typical farm environments. It is also known as an SCV Coupler or ½ inch Coupler.