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Internal unions have female threads and a fitting detail for zero volume fittings. The nuts have male (external) threads. Standard material is 300 series stainless. Also available in Hastelloy C, gold-plated stainless, and titanium versions.
Select the union with the bore that matches the ID of the tubing. If the IDs are different, choose the union with a bore which matches the smaller tube bore.
Bulkhead versions are designed to be mounted through an instrument panel or on a bracket. The fitting body is undercut so that it bites into the panel when the mounting nut is tightened, eliminating the need for a lock washer.