British made 15 lb / 15 psi radiator pressure cap suitable for a wide range of classic Audi models. The pressure rating is stamped on the cap for easy identification. Spring length is measured from the outside of the cap to the tip of the brass disc on the end of the spring. Cap sizes are illustrated in the product images. This cap is supplied as a double sealed cap and is suitable for use on a sealed recovery system. In a sealed recovery system, the cap (double seal) allows coolant to flow to and from the recovery or expansion tank, maintaining the integrity of the cooling system. Please note: Some early pressure caps only used one seal. If your existing cap is the single seal type (only one rubber seal – the small r.
