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  • Safe T Alert - Dual LP/CO Alarm - Flush Mount Black - 35-742-BL
  • 35 Series Dual Replacement Video Safe T Alert by MTI Industries, Inc.
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Safe T Alert - Dual LP/CO Alarm - Flush Mount Black - 35-742-BL

4.6 out of 5 stars (2,330)

$58.02
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Style: Alarm
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About this item

  • DUAL PROPANE & CO DETECTION – Patented Double-Duty Alarm upgrades your RV’s safety by combining Propane Gas and Carbon Monoxide detection in one unit. Replaces single 12V propane alarms without extra wiring or modifications.
  • EASY RV UPGRADE – Flush mount design fits Class A, B, C Motorhomes, Travel Trailers, Fifth Wheels, and Campers. Direct replacement for Safe-T-Alert 30-442 and most CCI Controls flush mount propane alarms.
  • 12V POWERED, NO BATTERIES NEEDED – Operates on 12v DC (108mA @ 12v DC) for reliable, maintenance-free protection. Includes low voltage warning and power-conserving circuitry.
  • ADVANCED SAFETY FEATURES – Alarm Mute button allows safe ventilation, while a rapid recovery sensor reactivates if propane or CO levels stay dangerous. Self-resetting for continuous protection.
  • CERTIFIED PERFORMANCE – Operates in extreme temperatures from -40°F to +158°F
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Product description

MTI
SafeTBanner2
Weatherproof Safety
Safe T Alert - Mini Dual LP/CO Alarm - Surface Mount Black - 25-741-BL
Safe T Alert - Mini LP Gas Alarm - Surface Mount Black - 20-441-P-BL
Safe T Alert - Dual LP/CO Alarm - Surface Mount Black - 35-741-BL
Safe T Alert - Dual LP/CO Alarm - Flush Mount Black - 35-742-BL
Safe T Alert - Mini Dual LP/CO Alarm - Flush Mount Black - 25-742-BL
Customer Reviews
4.4 out of 5 stars 55
4.5 out of 5 stars 293
4.6 out of 5 stars 2,330
4.6 out of 5 stars 97
Price no data no data $82.85 $58.02 $76.10
Dimensions 3.5" w x 2.5" h x 1.25" d 3.5" w x 2.5" h x 1.25" d 6" w x 1 7/8" h x 1 1/4" d 6.375" w x 2.875" h x 1.25" d 4.5" w x 3.25" h x 1.25" d
Universal Replacement no data no data no data no data no data
Direct Replacement
Alarm Type Dual Propane/LP Only Dual Dual Dual
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Customer reviews

4.6 out of 5 stars
2,330 global ratings
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Customers say

Customers find the fire alarm easy to install and appreciate that it's a direct replacement for the original unit, fitting perfectly in the same opening. The device receives positive feedback for its accuracy with no false alarms and safety features, with one customer noting it tests for both carbon monoxide and propane. While some customers consider it a great value, others find it pricey, and opinions about functionality and durability are mixed - some say it works great while others report it fails after a month, and some units last 5 years while others don't last 2 years.
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115 customers mention installation, 114 positive, 1 negative
Customers find the gas smoke fire alarm easy to install, with one customer noting it's a quick 2-screw/2-wire job.
Easy to install and works like a charm. Replacement of the old model that stopped working because it was at the end of its useful life fit perfectly.Read more
Had step by step instructions and was easy install. Product fit perfectly as it was the exact replacement partRead more
Exact OEM part and very easy to install. So glad my monitor is no longer going off at random times throughout the day and night....Read more
Easy replacementRead more
112 customers mention replacement quality, 107 positive, 5 negative
Customers are satisfied with the alarm as a replacement, noting it is an exact OEM replacement for expired units.
...great...heard aerosol sets it off tried it and it did ...lol perfect replacementRead more
...It was an exact replacement and took 5 minutes. Tools needed were a screwdriver, wire cutters/strippers and a couple wire nuts.Read more
A good replacement.Read more
...They ain't cheap but its for safety i ts not worth a life but good unit and very sensitiveRead more
49 customers mention fit, 47 positive, 2 negative
Customers are satisfied with how the alarm fits, noting that it matches existing openings and holes, with one customer mentioning it's an exact replacement for a 20-year-old leak detector.
Replaced what was in my 2004 Jayco. Perfect fit and fast install. Manufacture date was this year so no problems with short life span....Read more
Had to replace the item in our camper. Fit perfectly, haven't had any problemsRead more
perfect fit for an fr3. works as expectedRead more
This was an exact replacement for LP/C0 detector that had expired and exact fit. Working again as it should. GLRead more
20 customers mention accuracy, 14 positive, 6 negative
Customers find the alarm accurate and reliable, with no false alarms, and one customer notes it tests for both carbon monoxide and propane.
great detector at a good price and was delivered in a timely manor!Read more
Did not test with actual CO or propane. Otherwise it works, with no false alarms.Read more
It FALSE ALARMS within the first 12 hours of installation. Manufacture date stamp on unit: Dec. 2015...Read more
...Its test was good, with the same tone and volume as the original.Read more
15 customers mention safety, 14 positive, 1 negative
Customers appreciate the alarm's safety features, with one mentioning it provides protection against both carbon monoxide and propane, while another notes it's essential for RV living.
Easy to use and great for safetyRead more
...Good product for a bit of peace of mind camping with kids. No batteries needed. As long the camper battery is good or it's plugged in, this is on.Read more
...Took the camper out and didn't die - neither by CO2/LP poisoning, bears, snakes, falling off a cliff... so all in all it did exactly what I wanted...Read more
...When shopping for a replacement I saw this model which also provides CO protection. Had concerns about how it would fit in existing cutout....Read more
102 customers mention functionality, 71 positive, 31 negative
Customers have mixed experiences with the functionality of the smoke alarm, with some reporting it works great while others mention it fails.
What is it to go for my motorhome? It was at a great price and works great with highly recommend this product. Thank you Amazon....Read more
This sensor/alarm was a direct replacement for the original and works as advertised....Read more
...replacement unit cost $70 and only lasted 10 months before it started beeping and could not be reset. Very disappointing.Read more
Fast shipment. Good packaging. Easy to install direct replacement. Works fine.Read more
46 customers mention value for money, 31 positive, 15 negative
Customers have mixed opinions about the fire alarm's value for money, with some finding it a great value and a good investment, while others consider it rather pricey.
Great value, two sensors in one. Ipwith this unit I only need to switch out one sensor instead of having to order two....Read more
What is it to go for my motorhome? It was at a great price and works great with highly recommend this product. Thank you Amazon....Read more
For what it is and deos, this is far too expensiveRead more
great detector at a good price and was delivered in a timely manor!Read more
40 customers mention durability, 12 positive, 28 negative
Customers have mixed experiences with the alarm's durability, with some reporting it lasts exactly 5 years while others find it fails within 18 months.
This is old stock. These alarms need to be replaced every 5 years. This alarm was manufactured in September in 9-2022....Read more
Failed after six months. Replaced with PANGAEA PRG1000-A . Can replace MTI Safe-T-Alert .Read more
This is the second time I bought this item, it lasts for exactly 5 years before it alarms “end of life” and that is very expected and appropriate...Read more
...The green light was flashing, indicating it was expired and not working....Read more
New CO 2 and propane detector
5 out of 5 stars
New CO 2 and propane detector
Our current alarm has reached the dreaded end of life beep. The manufacture date was 2021 stamped on the back. Ordered a new one and the date on it is 2022. Had to research to be sure it wasn’t a waste of money. Below is what I found. Manufacturing vs. Service Date: The date on the back is the date of manufacture, but the 5-year, 60-month lifespan begins upon installation/powering, according to Forest River and RV Upgrade Store. Arrived new in clear box. Will update if I have any problems.
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Top reviews from the United States

  • 5 out of 5 stars
    GOOD PRODUCT as Advertised...
    Reviewed in the United States on June 8, 2026
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    Fair Price - Fast Delivery.. It was an exact exchange so it was a perfect fit for my Camper, fairly easy to install...

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  • 5 out of 5 stars
    It’s very easy DIY
    Reviewed in the United States on May 21, 2026
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    Perfect replacement and only takes a minute or two to install

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    Thanks, we'll investigate in the next few days.
  • 5 out of 5 stars
    easy install, works as advertised
    Reviewed in the United States on May 4, 2026
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    replaced our old CO/LP monitor with this flush mount one. easy to install and works as advertised.

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  • 5 out of 5 stars
    Good replacement with dual monitoring
    Reviewed in the United States on April 20, 2026
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    Perfect replacement for trailer. Installed easily in same location. Seems more accurate than other model.

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  • 4 out of 5 stars
    LP leak detector correct wiring
    Reviewed in the United States on May 20, 2026
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    Product works as it should but I have a 2000 Fleetwood Discovery 36T with 3 wires. On-line folks are wrong. You cannot cap red/white wire because it is the power supply and it will shut lp solenoid. Wire Red + Red/White together then black to black. Works great! I will add the 12V toggle shutoff switch later

    LP leak detector correct wiring
    4 out of 5 stars
    LP leak detector correct wiring
    Reviewed in the United States on May 20, 2026

    Product works as it should but I have a 2000 Fleetwood Discovery 36T with 3 wires. On-line folks are wrong. You cannot cap red/white wire because it is the power supply and it will shut lp solenoid. Wire Red + Red/White together then black to black. Works great! I will add the 12V toggle shutoff switch later

    Sending feedback...
    Thank you for your feedback.
    Sending feedback...
    Thanks, we'll investigate in the next few days.
  • 5 out of 5 stars
    Exact fit for replacing 20 year old leak detector
    Reviewed in the United States on April 11, 2026
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    Perfect replacement

    Sending feedback...
    Thank you for your feedback.
    Sending feedback...
    Thanks, we'll investigate in the next few days.
  • 5 out of 5 stars
    Easy install
    Reviewed in the United States on May 30, 2026
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    This was an easy replacement for my original CO2 alarm.

    Sending feedback...
    Thank you for your feedback.
    Sending feedback...
    Thanks, we'll investigate in the next few days.
  • 5 out of 5 stars
    New CO 2 and propane detector
    Reviewed in the United States on May 1, 2026
    Brief content visible, double tap to read full content.
    Full content visible, double tap to read brief content.

    Our current alarm has reached the dreaded end of life beep. The manufacture date was 2021 stamped on the back. Ordered a new one and the date on it is 2022. Had to research to be sure it wasn’t a waste of money. Below is what I found.

    Manufacturing vs. Service Date: The date on the back is the date of manufacture, but the 5-year, 60-month lifespan begins upon installation/powering, according to Forest River and RV Upgrade Store.

    Arrived new in clear box. Will update if I have any problems.

    New CO 2 and propane detector
    5 out of 5 stars
    New CO 2 and propane detector
    Reviewed in the United States on May 1, 2026

    Our current alarm has reached the dreaded end of life beep. The manufacture date was 2021 stamped on the back. Ordered a new one and the date on it is 2022. Had to research to be sure it wasn’t a waste of money. Below is what I found.

    Manufacturing vs. Service Date: The date on the back is the date of manufacture, but the 5-year, 60-month lifespan begins upon installation/powering, according to Forest River and RV Upgrade Store.

    Arrived new in clear box. Will update if I have any problems.

    3 people found this helpful
    Sending feedback...
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Top reviews from other countries

  • 5 out of 5 stars
    Safety Allert
    Reviewed in Australia on August 2, 2024
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    Replacement for old safety Allert. A must to monitor carbon monoxide & gas leaks in MH or Caravan saves lives. Works extremely well.

    Sending feedback...
    Thanks, we'll investigate in the next few days.
  • 5 out of 5 stars
    CO2 and LPG sensor
    Reviewed in Australia on March 10, 2024
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    Full content visible, double tap to read brief content.

    Great item easily installed fast postage

    Sending feedback...
    Thanks, we'll investigate in the next few days.
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Product Summary: Safe T Alert - Dual LP/CO Alarm - Flush Mount Black - 35-742-BL

From Safe T Alert

4.6 out of 5 stars, 2,330 ratings

Customer reviews

400+ bought in past week

About this Item

  • DUAL PROPANE & CO DETECTION – Patented Double-Duty Alarm upgrades your RV’s safety by combining Propane Gas and Carbon Monoxide detection in one unit. Replaces single 12V propane alarms without extra wiring or modifications.
  • EASY RV UPGRADE – Flush mount design fits Class A, B, C Motorhomes, Travel Trailers, Fifth Wheels, and Campers. Direct replacement for Safe-T-Alert 30-442 and most CCI Controls flush mount propane alarms.
  • 12V POWERED, NO BATTERIES NEEDED – Operates on 12v DC (108mA @ 12v DC) for reliable, maintenance-free protection. Includes low voltage warning and power-conserving circuitry.
  • ADVANCED SAFETY FEATURES – Alarm Mute button allows safe ventilation, while a rapid recovery sensor reactivates if propane or CO levels stay dangerous. Self-resetting for continuous protection.
  • CERTIFIED PERFORMANCE – Operates in extreme temperatures from -40°F to +158°F

Product Description

The Safe-T-Alert 35 Series Dual Propane/Carbon Monoxide Alarm with Flush Mounting detects both gas leaks and carbon monoxide gas simultaneously; Twelve volts power means no missing or dead batteries to replace and this alarm is built for extreme RV environments; This product meets RVIA/NFPA requirements and is listed to UL 1484 RV and UL 2034 RV; Available in white, brown, or black.

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