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This threaded NPT HALF coupling is typically what you'd have welded into your
vessel as the bulkhead for thread in sight glasses, dial thermometers, etc. The half coupling gives you female threads on ONLY ONE END. An alternative to a half coupling would be a weld spud, especially if you plan to use silver solder rather than welding.
Available in 1/2" and 1/4" NPT sizes.
Made from cast 304 stainless steel. Note that the outside finish on these is typically MATTE or cast finish meaning that it has not been machined to shiny.
The 1/2" couplings measure approximately 1.06" outside diameter.
The 1/4" couplings measure approximately .75" outside diameter.
It's always best to measure them in person if you're trying to have them fit snug in a drilled hole for welding.
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It's a threaded coupling 
