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  • VIDEO
  • Safe T Alert 20 Series Mini LP Gas Alarm - Propane Alarm - Surface Mount, White - 20-441-P-WT
  • 20 Series Unboxing Safe T Alert by MTI Industries, Inc.

Safe T Alert 20 Series Mini LP Gas Alarm - Propane Alarm - Surface Mount, White - 20-441-P-WT

4.7 out of 5 stars (2,583)

Lowest price in 30 days
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About this item

  • BUILT FOR RVS – Compact surface mount design ideal for Travel Trailers, Fifth Wheels, Truck Campers, and Folding Campers. Engineered for rugged RV environments.
  • ADVANCED PROPANE DETECTION – Alarm Mute button allows safe ventilation while the rapid recovery sensor reactivates if propane levels remain dangerous. Alarm activates at <25% LEL of propane or methane.
  • RELIABLE 12V POWER – Operates on 12v DC (75mA @ 12v DC) for dependable, battery-free protection. Innovative circuitry conserves power for long-term use.
  • SPACE-SAVING & EASY TO INSTALL – Compact case size: 3.5″W x 2.5″H x 1.25″D with included mounting bracket for simple installation in tight spaces.
  • DESIGNED FOR HARSH CONDITIONS – Operates in temperatures from -40°F to +158°F.

From the brand


Product description

MTI
Value
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 292
4.6 out of 5 stars 2,327
4.6 out of 5 stars 92
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 Family
About Brand

Product information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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Safe T Alert 20 Series Mini LP Gas Alarm - Propane Alarm - Surface Mount, White - 20-441-P-WT


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Product guides and documents

Safety and product resources

What's in the box

  • Safe-T-Alert 20-441-P-WT Mini Hard-Wired Propane/LP Gas Alarm - 12V, 20 Series, White
  • Customer reviews

    4.7 out of 5 stars
    2,583 global ratings

    Customers say

    Customers find the gas alarm to be an excellent replacement for existing units, particularly for RVs, and appreciate its easy installation and functionality. The product offers good value, has an exact fit, and serves as a reliable propane detector. Regarding durability, while some customers report it lasts up to 60 months, others mention it doesn't last more than three months. The mounting aspect receives mixed feedback - while it comes with a new mounting plate, some customers note it doesn't include mounting screws.
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    146 customers mention replacement quality, 143 positive, 3 negative
    Customers find the gas alarm to be an excellent replacement for existing units, particularly for RVs and campers.
    Exact replacement. Easy to install. Make sure you mark the positive and negative wires when removing the old unit....Read more
    Just what I needed... Great product!!Read more
    Perfect replacement and fast shipping. The detector only last 5 years, is good to replace early if you use your RV a lot. Made in USARead more
    Great buy! Good product. I'm pleased I ordered it here.Read more
    141 customers mention installation, 137 positive, 4 negative
    Customers find the gas alarm easy to install and connect, with one mentioning it took less than 5 minutes to replace.
    ...Easy to install. No issues at all. Not sure about some complaints about the manufacture date of the unit. Mine was dated Nov 2018....Read more
    For me it was an easy install. I connected the wires to an existing set. Make sure to slide the wall of the box off first....Read more
    I'm really happy with this propane detector and it's very easy to install. Comes with new mounting plate as well and good instructions.Read more
    easy installation and everyone should replace their units when needed to protect your family. Really good price and will purchase again when neededRead more
    122 customers mention functionality, 106 positive, 16 negative
    Customers find that the gas alarm works great and is reliable, with one customer mentioning it was up and running within half an hour of installation.
    Bought this one as a replacement for our camper. Easy installation & works great. If you're just replacing it, it'll only take about 10 minutes....Read more
    ...Everything else about it works great though. Tested and works well. Now to find some screws...Read more
    This was easy to install, works as advertised and at a reasonable price too....Read more
    Works as expected.Read more
    39 customers mention value for money, 31 positive, 8 negative
    Customers find the gas alarm to be a good value, describing it as an affordable replacement.
    ...Really good price and will purchase again when neededRead more
    Came in quick, works as expected, great price.Read more
    Arrived timely, fit as it should, good value.Read more
    We installed this in our camper and it worked about 3 weeks. Waste of money!Read more
    27 customers mention fit, 25 positive, 2 negative
    Customers are satisfied with how the gas alarm fits, noting it matches the wall mount perfectly.
    This arrived as promised, Was a perfect fit and works great. It was a relief to get the old one replaced.Read more
    Great price, exact fit.Read more
    ...to its being past it’s service life by a few years .This fit perfectly on the old mount and was an easy swap of power wires .Read more
    An Exact fit replacement 👌Read more
    14 customers mention propane leakage sensor, 13 positive, 1 negative
    Customers appreciate the propane leakage sensor, with one mentioning it's easy to keep alerted to leaks, and another noting it passed building inspection.
    Propane DetectorRead more
    the detector is fine; it was an exact replacement for the original unit and works fine.Read more
    THIS PRODUCT IS EXACTLY WHAT CAME OUT OF OUR TRAVEL TRAILER, AND IS EXACTLY AS DESCRIBED AS TO WHAT I NEEDED. THANKS!Read more
    So simple & such an important little thing to have. 2 wires to hook up & 1 less thing to worry with....Read more
    38 customers mention durability, 13 positive, 25 negative
    Customers have mixed experiences with the gas alarm's durability, with some reporting it lasts up to 60 months while others find it doesn't last more than 3 months.
    This detector lasted exactly 11.5 months. it began to beep without cause. A real depressing unit considering it was to last 5 years. Near JUNKRead more
    This replaced an expired detector (which alerted us by beeping nonstop!) in our travel trailer....Read more
    Bought and installed in August. Unit failed and flashes end of life in February. Can't find and contact info for the company. DO NOT BUY THIS PRODUCT.Read more
    ...Flashing END of LIFE today...should last more than 11 months for the price. Read the other reviews, no sense contacting the company. Disappointed....Read more
    17 customers mention mounting, 8 positive, 9 negative
    Customers have mixed experiences with mounting the gas alarm: while some received a new mounting plate, others report that the product doesn't include mounting screws.
    ...The only issue I have is since they require #4 flat head screws, not a size someone would normally have lying around, for a $50 detector, they...Read more
    ...(it does come with a bracket but I didn't want to take screws out....Read more
    Ok, the one I received was not a flushmount unit. It is surface mount (ie sticks out its full depth from whatever surface you mount it on)....Read more
    ...When ours failed, this one went in quickly and mounted to the existing plate on our 2014 Montana without an issue.Read more
    Can be user installed.
    5 out of 5 stars
    Can be user installed.
    Easy to remove old and install new IF the original was installed WITH ENOUGH SLACK in the Wiring to remove abd replace. This Safe-T- alert propane alarm is the EXACT brand and model currently up for replacement in my 2013 travel trailer. I trust the Safe - T - Alert brand.
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    Top reviews from the United States

    • 5 out of 5 stars
      Exact replacement for OEM detector every 60 months.
      Reviewed in the United States on March 23, 2026
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      The propane detector monitor that came with my 2021 grand design camper trailer says replace after 60 months, at 60 months and 2 weeks it started beeping. Time to replace. I bought this white one instead of the black like was original just because, it is the exact size, fits on the existing bracket (it does come with a bracket but I didn't want to take screws out. I used butt connectors to connect this unit to the existing wires after I SHUT OFF ALL POWER EVEN THE BATTERY DISCONNECT ALWAYS SHUT OFF ALL POWER BEFORE DOING ELECTRICAL WORK and easily crimped it in and voila, good for another 60 months. Easy to replace, easy to keep myself alerted to propane leaks.

      One person found this helpful
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    • 5 out of 5 stars
      RV gas
      Reviewed in the United States on May 13, 2026
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      Full content visible, double tap to read brief content.

      Direct replacement for the original version. Works good

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    • 5 out of 5 stars
      Exactly like our old one that failed!
      Reviewed in the United States on April 15, 2026
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      Full content visible, double tap to read brief content.

      This was the exact replacement of the one we had in our rv! Easy to hook up!

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    • 5 out of 5 stars
      Can be user installed.
      Reviewed in the United States on May 22, 2026
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      Easy to remove old and install new IF the original was installed WITH ENOUGH SLACK in the Wiring to remove abd replace. This Safe-T- alert propane alarm is the EXACT brand and model currently up for replacement in my 2013 travel trailer. I trust the Safe - T - Alert brand.

      Can be user installed.
      5 out of 5 stars
      Can be user installed.
      Reviewed in the United States on May 22, 2026

      Easy to remove old and install new IF the original was installed WITH ENOUGH SLACK in the Wiring to remove abd replace. This Safe-T- alert propane alarm is the EXACT brand and model currently up for replacement in my 2013 travel trailer. I trust the Safe - T - Alert brand.

      Sending feedback...
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    • 4 out of 5 stars
      Good replacement item
      Reviewed in the United States on March 28, 2025
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      Full content visible, double tap to read brief content.

      Still working great after a year now.

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    • 5 out of 5 stars
      Must have for your RV
      Reviewed in the United States on December 10, 2025
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      Full content visible, double tap to read brief content.

      Anyone who owns an RV knows that they are for the most part propane powered. This monitor replace the faulty one in our RV. It was an easy 5 minute install. Looks better than the ugly brown OEM one and my wife especially feels much safer not hearing the old one go off because it was faulty. Functions great and provides safety.

      One person found this helpful
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    • 5 out of 5 stars
      I would purchase again.
      Reviewed in the United States on May 26, 2026
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      Full content visible, double tap to read brief content.

      A great replacement item for the RV.

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    • 5 out of 5 stars
      Great quality and price
      Reviewed in the United States on November 23, 2025
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      This fit the wall mount I had perfectly. I was hoping to get a black one, but the white was available. So glad I could find the same alarm that came in my camper when I purchased it.

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    Top reviews from other countries

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    • 5 out of 5 stars
      Parfait !
      Reviewed in Canada on April 9, 2021
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      Je viens de recevoir l article. La date de fabrication est de seulement 2 mois, donc j en ai bien pour 5 ans ! Facile à installer, j ai fais un test avec une torche à propane, diffusion pendant 5 seconde de gaz et l avertisseur à sonner 10 secondes après !

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    • 4 out of 5 stars
      Colour of unit
      Reviewed in Australia on March 21, 2021
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      Full content visible, double tap to read brief content.

      Would have liked the option to purchase a black unit as it was replacing an existing one

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    • 5 out of 5 stars
      Once installed it pasted the sniff test--I used a Butane camp stove canister as the nozzle protrudes and is easily accessible. Word of caution
      Reviewed in Canada on July 3, 2018
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      Fast delivery, The build date was within a month of the install. The hardest part of the install was fabricating a patch over the hole left by the replaced unit. Once installed it pasted the sniff test--I used a Butane camp stove canister as the nozzle protrudes and is easily accessible. Word of caution, wear ear protectors when you test as you are very close to the unit and the noise is very high pitched. The unit did not come with screws--don't know if that was in error or not. If not you will need 4 number-4 X 1/4" flat or round head screws and the necessary wire connectors to join the new unit to the existing wires.

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    • 5 out of 5 stars
      Perfect for replacement of end of life monitor
      Reviewed in Canada on February 19, 2020
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      It replaced the same unit in less than 5 minutes. Easy installation as I simply pulled off out of date unit and replaced new one.

      I think the price was high but you can’t stay in an RV without a functional monitor in place.

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    • 4 out of 5 stars
      Out of date
      Reviewed in Canada on May 30, 2020
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      Full content visible, double tap to read brief content.

      Very easy to install and works as it should. This unit it to be replaced every 5 years. My only disappointment with the unit is it's old stock. I opened the package to install it to keep the family safe I installed it. The date is from 2018. It is now 2020. I already lost 2 years on this unit. I wrote the installed date hoping that it lasts more than the 3 years left

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    Product Summary: Safe T Alert 20 Series Mini LP Gas Alarm - Propane Alarm - Surface Mount, White - 20-441-P-WT

    From Safe T Alert

    4.7 out of 5 stars, 2,583 ratings

    Customer reviews

    100+ bought in past week

    Price

    No featured offers available

    Other sellers

    Other sellers

    About this Item

    • BUILT FOR RVS – Compact surface mount design ideal for Travel Trailers, Fifth Wheels, Truck Campers, and Folding Campers. Engineered for rugged RV environments.
    • ADVANCED PROPANE DETECTION – Alarm Mute button allows safe ventilation while the rapid recovery sensor reactivates if propane levels remain dangerous. Alarm activates at <25% LEL of propane or methane.
    • RELIABLE 12V POWER – Operates on 12v DC (75mA @ 12v DC) for dependable, battery-free protection. Innovative circuitry conserves power for long-term use.
    • SPACE-SAVING & EASY TO INSTALL – Compact case size: 3.5″W x 2.5″H x 1.25″D with included mounting bracket for simple installation in tight spaces.
    • DESIGNED FOR HARSH CONDITIONS – Operates in temperatures from -40°F to +158°F.

    Product Description

    White 12-Volt Flush Mount 6 inch x 1.875 inch x 1.25 inch 30-442 6 inch x 2.875 inch x 1.25 inch, features, UL listed for recreational vehicle use. Meets RVIA requirements test and reset button mutes alarm during ventilation. Tests all alarm functions in one easy step. No dangerous gas required to test alarm. Wide operation range 8-16 volts. Avoid most low battery voltage alarms. Fully operational during mute cycle.

    Important Information

    Proposition 65 Warning for California Consumers

    WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    Product Guidance & Documents

    Installation Manual (PDF)

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