Lennox 51W91 Pressure Switch those must be sourced as those must be sourced as separate technical components Double Pole Double Throw means this relay can switch two separate circuits at once This rating indicates the specific negative pressure threshold required to close the SPST switch contacts Secure Interfacing: Dual 1 4" barb configuration ensures a leak free seal and reliable signal to the integrated furnace control
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Lennox 51W91 Pressure Switch those must be sourced as