The Lochinvar & A.O. Smith 100074221 Rod Holder is a replacement mounting component designed to securely support and position the flame sensor or ignition rod within compatible gas-fired tankless water heaters. It helps maintain proper rod alignment near the burner assembly, supporting reliable flame detection and ignition operation. This component is used in Lochinvar and A.O. Smith ... https://www.partshnc.com/100074221-lochinvar-ao-smith-rod-holder