The WAGO Gelbox has only been tested and approved in combination with WAGO’s 2273 Series PUSH WIRE® Connectors and WAGO’s 221 Series Splicing Connectors and Inline Splicing Connectors with levers for conductor cross-sections up to 6 mm². It is available in nine sizes. Each box has a terminal diagram that specifies a fixed assignment depending on what connectors will be used.