Shop › 1/2" NPT x 1/2" copper fitting - Thermometer adapter Image 1 of 1 1/2" NPT x 1/2" copper fitting - Thermometer adapter $5.99 Solder this part to your still to use a 1/2" NPT thermometer.Installs with a 5/8" drill bit. Add To Cart Added! Solder this part to your still to use a 1/2" NPT thermometer.Installs with a 5/8" drill bit. Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More You Might Also Like Tri Clamp Gaskets - PTFE Teflon from $5.49 Boiler Drain Gasket $1.99 Bubble Plate Gaskets from $2.99 Screened Tri clamp Gaskets - 100% Silicone #10 Stainless Steel Mesh from $17.99 Boiler Lid Gasket Silicone $19.99