The RAC814 is a replacement wire brush for the Ryobi patio cleaner ideal for cleaning between bricks, paving stones and more. Compatible with both the Ryobi OPC1800 Patio Cleaner and RY18PCA Patio Cleaner. For cleaning applications on softer surfaces such as sandstone the RAC818 Gentle Nylon Brush is a far more suitable choice and is also compatible with the RY18PCA Patio Cleaner.