Add some individuality to your bike with the RFX Piston Shape Alloy Valve Caps, complete with anodised finish and rubber seal.Available in a wide range of coloursPiston shape styleAluminium constructionComplete seal and pressure securityAnodised finished with a rubber sealIt is widely believed that the cap on a tyre valve is mainly a dust cap. It is certainly important to protect the delicate components of the tyre valve from the effects of dust, dirt, moisture and road salt, however the tyre manufacturers will say quite clearly that the cap is the PRIMARY method of ensuring an air tight seal at the tyre valve.Although the core is part of the sealing mechanism, complete pressure security can only be achieved by means of a good fitting with a proper rubber seal.