Safe T Alert - Dual LP/CO Alarm - Flush Mount Black - 35-742-BL
Return this item for free
We offer easy, convenient returns with at least one free return option: no shipping charges. All returns must comply with our returns policy.
Learn more about free returns.- Go to your orders and start the return
- Select your preferred free shipping option
- Drop off and leave!
Purchase options and add-ons
| Brand | Safe T Alert |
| Style | Alarm |
| Power Source | Corded Electric |
| Color | Black |
| Product Dimensions | 1"D x 6.38"W x 2.88"H |
| Item Weight | 0.4 Pounds |
| Alarm | Audible |
| Sensor Type | Photoelectric |
| Global Trade Identification Number | 00715456357447 |
| Material | Plastic |
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
Frequently bought together

Similar items that may deliver to you quickly
MTI Industry Safe-T-Alert 85 Series Carbon Monoxide Propane Gas Alarm - 12V - Black [85-741-BL]FREE Shipping by AmazonGet it as soon as Wednesday, Jun 17
Safe T Alert - Dual LP/CO Alarm - Flush Mount w/Trim Ring White - 25-742-WT-TRFREE Shipping by AmazonGet it as soon as Wednesday, Jun 17Only 18 left in stock - order soon.
Safe T Alert 20 Series Mini LP Gas Alarm - Propane Alarm - Surface Mount, White - 20-441-P-WTGet it as soon as Thursday, Jun 18
Safe T Alert 30-441-P-WT Classic Propane/LP Gas Alarm - 12V, 30 Series Surface Mount, WhiteFREE Shipping by AmazonGet it as soon as Wednesday, Jun 17
Product description
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
|
|
|---|---|---|---|---|---|
|
Add to Cart
|
Add to Cart
|
Add to Cart
|
|||
| 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$82.85 | $58.02$58.02 | $76.10$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 |
Product guides and documents
Product information
| Power Source | Corded Electric |
|---|---|
| Alarm | Audible |
| Sensor Type | Photoelectric |
| Product Style | Alarm |
|---|---|
| Color | Black |
| Item Dimensions D x W x H | 1"D x 6.38"W x 2.88"H |
|---|---|
| Item Weight | 0.4 Pounds |
| Enclosure Material | Plastic |
|---|
Warranty & Support
Feedback
| Brand | Safe T Alert |
|---|---|
| Model Number | 35-742-BL |
| Global Trade Identification Number | 00715456357447 |
| Manufacturer Warranty Description | Warranty |
| Number of Items | 1 |
| Manufacturer | MTI Industries |
| UPC | 715456357447 |
| Mfr Part Number | 35-742-BL |
| Unit Count | 1.0 Count |
| Item Type Name | Safe-T-Alert by MTI Industries 35-742-BL Dual LP/CO Battery Powered Alarm - 12V, 35 Series Flush Mount, Black |
| Built-In Media | Safe-T-Alert by MTI Industries 35-742-BL Dual LP/CO Battery Powered Alarm - 12V, 35 Series Flush Mount, Black |
| Best Sellers Rank |
|
| ASIN | B009XTZ0XQ |
| Customer Reviews |
4.6 out of 5 stars |
Safety and product resources
Safety documents
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Generated from the text of customer reviewsSelect to learn more
Reviews with images
New CO 2 and propane detector
Top reviews from the United States
- 5 out of 5 stars
GOOD PRODUCT as Advertised...
Reviewed in the United States on June 8, 2026Fair Price - Fast Delivery.. It was an exact exchange so it was a perfect fit for my Camper, fairly easy to install...
Sending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
It’s very easy DIY
Reviewed in the United States on May 21, 2026Perfect replacement and only takes a minute or two to install
Sending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
easy install, works as advertised
Reviewed in the United States on May 4, 2026replaced our old CO/LP monitor with this flush mount one. easy to install and works as advertised.
Sending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Good replacement with dual monitoring
Reviewed in the United States on April 20, 2026Perfect replacement for trailer. Installed easily in same location. Seems more accurate than other model.
Sending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 4 out of 5 stars
LP leak detector correct wiring
Reviewed in the United States on May 20, 2026Product 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

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...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Exact fit for replacing 20 year old leak detector
Reviewed in the United States on April 11, 2026Perfect replacement
Sending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
Easy install
Reviewed in the United States on May 30, 2026This was an easy replacement for my original CO2 alarm.
Sending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again - 5 out of 5 stars
New CO 2 and propane detector
Reviewed in the United States on May 1, 2026Our 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.

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 helpfulSending feedback...Sending feedback...HelpfulThank you for your feedback.Sorry, we failed to record your vote. Please try againThanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again
Top reviews from other countries
John & Joyce Sutton5 out of 5 starsSafety Allert
Reviewed in Australia on August 2, 2024Replacement 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.Sorry, We failed to report this review. Please try again
Carl.A5 out of 5 starsCO2 and LPG sensor
Reviewed in Australia on March 10, 2024Great item easily installed fast postage
Sending feedback...Thanks, we'll investigate in the next few days.Sorry, We failed to report this review. Please try again
Product summary presents key product information
Keyboard shortcut
shift
+
alt
+
opt
+
D
Product Summary: Safe T Alert - Dual LP/CO Alarm - Flush Mount Black - 35-742-BL
From Safe T Alert
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
Product Guidance & Documents
Feedback
Did you find this product summary feature useful?









