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There's more than one way to configure the cooling-hose routing, but with the radiator so deep into the nose of the Roadster, you will have to use some sort of filler neck or degas tank to properly fill the cooling system. We love the clean look and fit of this Forte's Parts Connection degas tank ($150) for the Roadster. It mounts on the passenger-side F-panel and allows easy filling of the cooling system and even has a 31/48-NPT hole in the bottom for a cooling-fan thermostatic switch or other sensor. The hose from the water neck to the degas tank is a stock 5.0 Mustang upper hose, cut down. The hose from the tank to the radiator is a Dayco (PN 70965), also cut to fit, and the routing is clean. Later, we'll cover our hoses with more of Mr. Gasket's G-Sleeve for some fancy looks.