Large Big Green EGG Expander for ConvEGGtor, CGS PSWooBest at handling Egg's ConvEGGtor, Biggest sliding second grid. Check our precautions on half moons and cast iron. What's with the PSWoo name: PS stands for "platesetter," the original term for todays ConvEGGtor. Woo honors the first EGGhead to receive our original fixed grid expander. Our PSWoo is the original to handle the ConvEGGtor and provide a sliding second level. The PSWoo components are proudly made in the USA. What the PSWoo does better than