Check the listing for details. Merrychef E4S Cast Tuned Waveguide SA3138 - Free Shipping + Geniune OEM. Condition: New. Listed at 301.73 USD. Our eBay Store About Us Contact Us Add to Favorite Sellers E4S Cast Tuned Waveguide $301.73 E4S Cast Tuned Waveguide. This is a genuine OEM (Original Equipment Manufacturer) part. Merrychef is a pioneer in the application of microwave energy in catering, and the first to produce a microwave-accelerated combination oven. Use genuine OEM parts for safety reliability and performance. This is a genuine OEM (Original Equipment Manufacturer) part. Merrychef is a pioneer in the application of microwave energy in catering, and the first to produce a microwave-accelerated combination oven Use genuine OEM parts for safety reliability and performance This is a genuine OEM (Original Equipment Manufacturer) part. Merrychef is a pioneer in the application of microwave energy in catering, and the first to produce a microwave-accelerated combination oven Use genuine OEM parts for safety reliability and performance -->