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3/4" NPT Standard Well Made in the USA.

Honeywell Copper Bulb, 121371B, W/ 1-1/2&quot; Insulation 

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Honeywell Copper Bulb, 121371B, W/ 1-1/2" Insulation

Honeywell Copper Bulb, 121371B, W/ 1-1/2" Insulation