STI Series Stopper® II, Stopper II

Manufacture: kidde
Product code: STI

This unique and patented device helps to prevent false fire alarms without restricting legitimate alarms ✔️
✅ It consists of a tamper-proof, clear Lexan polycarbonate shield and frame that fits easily over manual pull stations ✔️
✅ When lifted to gain access to the actual alarm, it sounds a piercing warning horn. Immediate attention is drawn to the pull station and a prankster will run or be caught. Legitimate alarms can still be pulled. Use proven in thousands of applications around the worldincluding colleges, schools, hospitals, nursing homes, correctional institutions, hotels/motels and stores.


Consulting hotline: 0944934114
Product information

Standard Features

• Fits virtually all pull stations

• Tested and approved by wide range of fire prevention and testing authorities

• Unconditional lifetime guarantee against breakage and damage to molded polycarbonate cover

• Guards against physical damage to manual pull station

• Weatherproofing option

• Optional 9-volt alkaline battery (included) powered horn

Testing Approvals

Stopper II has been tested and approved or listed by:

• Underwriter Laboratories No. 49G2

• Underwriter Laboratories of Canada Issue No. 13959C

• Factory Mutual No. OG6A2.AY

• New York City Board of Standards No. 947-81-SA

• State of California (approval not required)

• General Service Administration


Size of Pull Station Accommodated The Stopper II can be installed over a flush-mounted station up to 5½ inches (140mm) wide x 6¾ inches (171mm) high. However, the pull station’s maximum dimensions will decrease as its depth (distance wall) increases. e.g.:

3¼ inch (19mm) deep pull station may be 5 inches (140mm) wide x 6 inches(152mm) high

1-5/8 inch (41mm) deep pull station may be 5 inches (127mm) wide x 6 inches (152mm) high

2-3/8 inch (60mm) deep pull station may be 4 inches (102mm) wide x 5 inches(146mm) high

STI Series Stopper® II, Stopper II

2 inch (70mm) deep pull station may be 3 inches (76mm) wide x 5 inches (140mm) high


Two types of mounting are available. Flush-mounted means the pull station is mounted directly on the wall. Surface-mounted means the pull station is mounted on an electrical box away the wall.

STI Series Stopper® II, Stopper II

Ordering Information

Catalog Number Description Ship Wt. Ibs (kg)
STI-1100 Stopper II with Horn (UL/ULC) — Flush 1.3 (0.6)
STI-1130 Stopper II with Horn (UL/ULC) — Surface
STI-1200 Stopper II without Horn — Flush
STI-1230 Stopper II without Horn — Surface
STI-1250 WeatherStopper, flush c/w gasket (STI-3002) 1.3 (0.6)
STI-3150 WeatherStopper, surface, c/w gaskets (STi3002 x2), 2” Spacer (STI-3100) and conduit gasket kit 1.3 (0.6)


STI-3100 2 inch (50mm) Spacer 0.5 (0.2)
STI-3002 Weatherproofing Gasket 0.2 (0.1)
STI-3003 Weatherproofing Conduit Gasket
STI-3004 Conduit Insert
STI-1280 Black plate for rough wall mounting


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