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Waterco Baker Hydro HRV Bulkhead Nut (31B9002) deltrolcontrols while the heater while the heater particularly on older equipment where the original top has seen years of pressure A bulkhead nut is useful because it helps secure the connection through the wall or housing of the system and plays a direct role in whether the assembly feels properly tightened and serviceable Replacing the proper bulkhead nut can make a meaningful difference in how secure the finished connection feels
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