Need to replace an RV propane gas alarm? Start with the model printed on your old detector, then check whether it attaches to the wall surface or fits into a recessed opening. MTI Safe-T-Alert 20-441, 30-441, 30-442 and 80-441 models do not use the same housing. This guide compares their manufacturer-listed dimensions and shows corresponding NewRVParts products.
Recognize the 20, 30 and 80 series by mounting style
The front outline and mounting method often narrow the search faster than colour. These original diagrams show the principal housing styles, not full-size templates.
Compact surface-mount
Surface bracket
30-series: mounting changes the shape
Low-profile trim-ring style
With ring: 7″ × 4″
Safe-T-Alert propane-only alarm size chart
| Series / models | Mounting | Manufacturer face/body size |
|---|---|---|
| 20-441-P | Compact surface-mount | 3½″ W × 2½″ H × 1¼″ D; separate mounting bracket |
| 30-441-P | Surface-mount | 6″ W × 1⅞″ H × 1¼″ D |
| 30-442-P | Flush/recessed | 6⅜″ W × 2⅞″ H face; confirm cavity clearance separately |
| 80-441-BL-TR / WT-TR | Low-profile alarm with trim ring | Body 4¼″ W × 2¾″ H × ¾″ D; with trim 7″ W × 4″ H × 1″ D |
The colours in the exact part numbers matter: BL indicates black and WT white in these listed variants. The 80-series trim ring can help cover previous screw holes, but it does not establish a fit for every recessed opening.
What to compare before buying a replacement
Read the part number and replacement date on the existing alarm label. Confirm that the old unit detects propane only, not both propane and carbon monoxide. Then compare surface versus recessed installation, case dimensions, the old wall opening, mounting holes and the required power source. MTI lists these families for 12V DC RV systems.
Safe-T-Alert specifies a limited service life for its gas alarms. Follow the replacement date on the installed detector; do not treat a working indicator light as evidence that an expired sensor remains protective. If an old alarm controls a propane shutoff solenoid, a basic propane-only replacement cannot be assumed to preserve that function. Have its relay and valve arrangement identified by a qualified RV technician.
The maker also recommends checking original certification marks and readable model/date labels when assessing a replacement alarm. Check the appliance manufacturer’s instructions for the approved mounting location, wiring and testing.
Find the exact Safe-T-Alert models in our catalog
These cards use the corresponding NewRVParts product listings and catalog images. Each item is shipped from supplier warehouses; in-person viewing and pickup are not available. Open the product page to see current availability and the original MPN.
Compact black propane-only model. Manufacturer housing: 3½ × 2½ in.
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Long, narrow black 30-441 surface housing; manufacturer face: 6 × 1⅞ in.
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Black 30-442 flush model, with a wider front plate than the 30-441.
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White variant of the 30-442 flush model; compare opening and faceplate.
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Black universal-style propane alarm with 7 × 4 in outer trim ring.
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White version of the 80-441 alarm with covering trim ring.
View details and availabilityContinue with related RV propane parts
Propane alarms warn occupants about a possible gas hazard, but are not tools for adjusting a regulator or checking appliance pressure. The related pages identify those separate components.