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This special valve assembly is designed for use with the Hot Head Engine Heater (formerly Part No. 3750-401). Although we no longer carry the Hot Head, we still offer these fittings to retrofit existing installations, or for those who plan to build their own preheater system. The valve installs in your radiator hose to give you inlet and outlet ports for your Hot Head system. It also ensures that the coolant being pumped by your Hot Head flows through the entire cooling system.
Male 10AN inlet and outlet ports let you add your own remote connection hoses. This allows you to locate the valve anywhere in your system, and the Hot Head hose connections anywhere on the car. A special internal flapper valve between the two ports closes when the Hot Head is pumping. This prevents the coolant from simply flowing right back out the outlet fitting. The non-sprung flapper valve presents almost no obstruction to the normal flow of coolant when the engine is running.
Each size measures 5" long overall. The fittings measure 2.75" from one end of the weld fillets to the other. In other words, installation requires a minimum 5" straight hose run and will add a 2.75" gap between the two ends of the coolant hoses. Includes 2 worm-drive hose clamps.