Single Pole Dual Pressure Control, SPST Switching, 20" Wc to 100 Psi Low Pressure, 7 Psi to 50 Psi Differential Low Pressure, 100 Psi to 500 Psi High Pressure Range, 65 Psi < 300 Psig, 75 Psi 300-400 Psig, 95 Psi > 400 Psig High Pressure Differential, 1/4" Female NPT Connection, For Ammonia