Home / Retarder Equipment / Two Retarder Relay Box Haugland Two Retarder Relay Box Haugland TERRB3 Two Retarder Relay Box Haugland Enquire about this product SKU: 2151 Category: Retarder Equipment Tag: Haugland Product ID: 2151 Related products Klam Retarder Kit – Conversion EPM/ECM to ECS System NEW Telma Retarder Relay Box TYPE 121/124