These indoor/outdoor polycarbonate pull station covers help protect devices without restricting legitimate operation. The versatile fire alarm covers help prevent accidental and intentional physical damage, dust and grime as well as severe environments inside and out. Low profile models with a horn (STI-14000 series) flash and sound when cover is lifted. Universal cover options: cover with or without horn, flush mount, surface mount or waterproof back box models. Maximum protrusion is 4 inches deep.