A: The size listed is the inner diameter.
A: It is 1/8” NPT (National Pipe Thread). All NPT is by definition a tapered thread that facilitates an interference fit thereby causing a better seal at the junctions. Any mating 1/8 NPT pipe will mate with this schrader valve and most tap & die kits include NPT threading tools if you are inclined to create your own installation.
A: The outside diameters are 1/8" 27 NPT and 5/16 32 UNEF.
A: The threads on this are 1/8" NPT.
A: It is brass. Says on the package that it “replaces worn air carry tank valves” P/n MP3229, Campbell Hausfeld, 100 Production Drive, Harrison, Ohio 45030 (800) 543-640 I would contact the manufacturer for specific information.
A: composed mostly of brass, 150 max PSI
A: Hardware in a store that has it.
A: On-line order shipped free to my local Home Depot for pick up.