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The MARS 39004 is a professional-grade 390 Series SPDT Changeover Switch designed for automatic seasonal transition in hydronic heating and cooling systems
This part is standard in many Copper-Fin and early-model commercial water heaters
Featuring a stainless steel power element
ensure you use a correctly rated run capacitor to maintain proper phase angle and efficiency
ASCO 8215G23 Solenoid Valve Refrigerant The MARS 39004 is aThe ASCO 8215G23 Solenoid Valve is a high performance 2 way normally open gas shutoff valve engineered for precision in industrial and commercial combustion systems. Featuring a durable aluminum body and resilient NBR seals, this valve is specifically designed for air fuel gas vent applications. With a 1 2" NPT connection and a high flow capacity of 4 Cv (approximately 206,250 BTU hr), it ensures reliable operation at pressures ranging from 0 125 PSI.
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