Modine 5H0731150002 Gas Valve R 410A mercury flame sensors must be mercury flame sensors must be matched by their specific model number (3049 115) or cross referenced via the original sensor's specifications Simple Integration: Includes standard 1 4" and 3 16" quick connect terminals designed for existing 24V wiring harnesses This Modine unit heater part features a versatile 1 2" x 3 4" NPT connection configuration (3 4" inlet and 1 2" outlet) to accommodate high capacity gas lines while maintaining a compact footprint for tight cabinet installations Key Benefits for Technicians: Direct OEM Substitution: Fully replaces the older 5H73115 2 model without the need for manifold modifications or bracket adjustments