STI STI Stopper II Activate Fire Alarm Cover, STI-1230, Surface Mount, Polycarbonate AED460.00 AED448.00 (Incl.VAT) STI Stopper II Fire Alarm Cover is a unique device has helped prevent false fire alarms around the world for decades, without restricting legitimate operation of devices such as larger fire alarm break glass call points. The Stopper II is ideal for... Add to Cart Buy Now