This aluminum alloy external cross clamp fitting for lean tubes differs from conventional 4-way through connectors. It features two clamping grooves that lock onto lean tubes, enabling two pipes to form an external cross shape (one horizontal, one vertical). This is one of the most widely used fittings for lean tube systems.

Each complete set consists of two ADC-12 aluminum alloy clamping plates, paired with an M6 bolt and nut.