Specially designed cover / dust caps for blocking off redundant connections, seal off vacuum connections, carburettors, Intake manifolds etc. Simply push over this silicone cap colour coded to match all ASH hoses, and most other UK hose brands Our specially designed Silicone CAPS are specially molded and designed to fit over metal / hard pipe outlets you wish to block off or protect from dust or debris. Also very useful product if you need to blank off redundant breathers, connections, Dump Valves etc.. Silicone caps are not reinforced with fabric, therefore not suitable for blocking off areas under pressure.