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Reotemp Threaded Thermowell, 4" 304 SS, 1/2" NPT, 2.5" Insertion, Straight Shank, .260" Bore, 4.25" Overall
https://www.branom.com/shop/st4304-hs-reotemp-threaded-thermowell-4-304-ss-1-2-npt-2-5-insertion-straight-shank-260-bore-4-25-overall-186775
https://www.branom.com/web/image/product.template/186775/image_1920?unique=c1b9893
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Threaded Thermowell
Element Length (A)=4"
Material: 304 Stainless (std)
Process Thread: 1/2" NPT
Insertion (U)=2.5"
Straight Shank
.260" bore, for 1/4" dia. Element
Overall (L)=4.25"