|AN840 HOSE NIPPLE, Pipe Thread|
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Works as designed.
These work great and are always better than for aerospace applications.
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The AN840-4 has 1/8" NPT and a 1/4" nipple fitting. It can be used on a Facet pump with 1/8-27 pipe thread.
The "TUBE I.D." column is in reference to the rubber tube inside dimension to be used on that unit. These units have national pipe thread, which is a tapered thread, and not measured to identify the listed size, but if the hole has NPT threads, and is approx 1/2", then you most likely need a 1/4" NPT threaded unit. The AN840-6D is an aluminum fitting that has 1/4" NPT & would use a 3/8" I.D. rubber hose.