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The Zonefirst SPS is a ruggedized dual static pressure switch designed for contractors who need precise modulating control over HVAC bypass dampers
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Maxitrol M420B-1/2 Valve 30067439-890 The Zonefirst SPS is aThe Maxitrol M420B 1 2 is a professional grade modulating gas valve engineered for atmospheric burners and indirect fired heating systems. Designed specifically for integration with the Maxitrol Selectra Series 94 and A200 electronic modulation systems, this 1 2" NPT valve provides precise, infinite flame adjustment to maintain tight temperature tolerances. The "B" designation indicates that both sides are fitted for low fire adjustment, allowing
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