Upgraded your ProBoat BlackJack 42 to Dual Cooling. Includes all the parts needed to convert the ProBoat Black Jack 42 to a dual cooling system. The ProBoat stock tubing is 6mm x 3mm, we include a larger 8mm x 4mm silicone tubing in the color of your choice. Includes: (1) 7' (2000mm) Piece of colored 8mm diameter tubing, pn# mo-color-tub. (2) Large bore water outlets in Silver anodized color, pn# ose-80905. (2) Bulkhead water fittings for the transom in Silver anodized color, pn# ose-80898. (6) 4" Black zip-ties NO Instructions, please see the pictures on this page for info.Note: Boat not included!