25 & 30HP J-Tubes, Pair. SCH1080-850 SCH1080-850 £45.00 Quantity: at £45.00 each Add To Basket These J-Tubes are designed to fit all 25HP and 30HP engines. For those of you that do not wish to have heat exchangers any more these J-Tubes are a direct replacement. These require the flanges welding on. These are also ideal for repairing those old original heater boxes on all early engines. Sold as a pair.