Will Call Restrictions: Due to the COVID-19 outbreak and Minnesota's "Stay at Home" executive order, only high priority, "can't wait" orders are being fulfilled on-site until at least April 30. Shipping continues as normal. Please contact us for more information.
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McDonnell & Miller model number TC4 is a Test-N-Check hot water boiler control valve which simplifies the code mandated testing of low water cut-offs by eliminating the need to drain the system.