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Nuts, Knobs, O-Rings

(120 products)

Heater Hardware

Stop drips and secure your equipment with Heater Nuts, Knobs, and O-Rings. From split nuts that repair broken union threads without plumbing work to replacement thermostat knobs, we have the small hardware that makes a big difference in your repair.

Find the specific fittings you need to seal your heater.

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