Leakbee RV Propane and Carbon Monoxide Detector R503 Flush-Mount Black — 2-in-1, 100 dB Alarm, 12V DC

The Leakbee R503 is a flush-mount 2-in-1 detector that monitors both propane (LP) gas leaks and carbon monoxide in RVs, providing visual readout and a 100 dB audible alarm for fast, reliable alerts.

Whether you're in a motorhome, travel trailer, truck camper, or motor coach, the Leakbee R503 combines two independent high-sensitivity sensors into a single, compact unit built for 12 V DC recreational vehicle electrical systems. Designed to replace older RV detector model #31011, it installs with lever-nut connectors for quicker wiring and displays real-time CO levels on a digital LED readout while sounding a powerful alarm when dangerous concentrations or gas leaks are detected.

How does the R503 detect both propane and carbon monoxide?

The R503 houses two separate sensors tuned for combustible gas (propane/LP) and carbon monoxide, which prevents cross-interference and improves detection accuracy in mixed-air environments typical inside RV cabins. The device constantly monitors air and triggers the 100 dB alarm when readings exceed preset safety thresholds.

• Independent propane and CO sensing elements for cleaner readings.
• Continuous real-time monitoring with immediate audible alert.
• LED digital readout shows detected CO concentration levels.
• Failsafe design suited to typical RV ventilation and cabin size.

What makes installation on an RV simple and fast?

The R503 is optimized for RV installers with a user-friendly faceplate and lever-nut connectors that eliminate tape, wrapped butt connectors, and many solder joints. The face cover fits common RV cutouts and matches the screw spacing of legacy model #31011, reducing modification time when upgrading existing systems.

• Face cover: 4 5/8" x 4 5/8" for neat flush mounting.
• Wall cutout compatibility: fits 2"–3 15/16" width and 3 3/8"–3 15/16" height openings.
• Lever-nut connectors for faster, secure wiring without electrical tape.
• Wide operating voltage: 12 V DC ±20%, suitable for most RV electrical systems.

How will I see and hear an alarm while traveling?

The detector provides both visual and auditory notifications: a bright LED numeric display shows CO concentration, and a 100 dB siren warns of dangerous propane or CO levels. This dual-mode alert ensures you notice an issue whether you’re awake, asleep, or in a noisy environment.

• 100 dB alarm audible across the cabin and nearby compartments.
• Digital LED display for immediate CO level awareness.
• Distinct alarm patterns help differentiate gas leak vs. CO alerts.
• Flush black faceplate blends with interior aesthetics and resists tampering.

What warranty and technical support are available?

Leakbee is staffed by gas industry technicians and engineers who back the R503 with a strong support program and a lifetime technical assistance commitment. If issues arise within the initial warranty window, Leakbee provides a replacement service to minimize downtime on the road.

• Lifetime technical support from gas professionals.
• Replacement service available within 60 months for covered issues.
• Documentation and installation guidance included with the unit.
• Designed to meet the needs of RV owners and technicians alike.

Who this detector is for: RV owners, fleet operators, and technicians seeking a compact, easy-to-install safety upgrade that detects both LP gas and carbon monoxide. The R503 suits DIY installers who want a plug-and-play replacement for older model #31011 cutouts, as well as professionals who value lever-nut wiring and clear digital readouts. If you want dual-sensor protection, a loud audible alarm, and continued manufacturer support while traveling or parked, the Leakbee R503 is built for your motorhome, travel trailer, or truck camper.