Lochinvar & A.O. Smith 100109680 Pilot R 407A ensure the sensing lines are ensure the sensing lines are clear of debris and the diaphragm is oriented according to the manufacturer's specification for accurate pressure sensing Ensure your humidification equipment operates at peak performance by choosing this authentic Armstrong International humidifier part for your next mechanical service or facility maintenance project Key Benefits OEM Compatibility: Exact Lochinvar 100109680 replacement ensures zero clearance mounting and proper alignment with the main burner tray a full assembly swap is usually more efficient than cleaning individual components