York S1 023 16881 000 Fitting L99H008 System Longevity: Protects the burner System Longevity: Protects the burner plate and surrounding electronic components from premature heat induced fatigue This high capacity relief valve is a standard choice for commercial boiler maintenance Can this be used on both positive and negative pressure ports System Reliability: Eliminates false readings caused by cracked or improperly seated aftermarket tap fittings
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York S1-023-16881-000 Fitting L99H008 System Longevity: Protects the burner