What do you mean, "towing behind your hoseboat, is there a product for this?" What do you mean product. Like an attachment of some sort?
Your ski has the 4-TEC engine and a closed loop cooling system. But your open loop system to your exhaust will back water up through it if you don't pinch off that inlet hose from the pump while exceeding 15 mph.
The ski really doesn't tow that well behind fast moving craft.