Anodized (ie electro-plated) chances are they are chrome or brass plated.
what does K stand for in K( , K 12 and K 14 pipes and fittings
That is a term started in WW2 for nuts, bolts, fittings etc. to differentiate them from foreign fittings. It means Army/Navy.
PIPE-VALVES-FITTINGS (PVF) Basically the industry that sells pipes and fittings to other industries who use them
BIP is Black Iron Pipe.
Worught Pipe Bend
Maybe: Wrought Austenitic Stainless Steel Piping Fittings
WP is used in front of the grades for pipe fittings after the production standard. Like ASTM A403 WP304L. TP is used in front of the grades for pipes (not fittings) after the production standard. Like ASTM A312 TP304L.
AN stands for Army Navy. The AN fittings have a 37 degree conical end which is what makes the seal.
Pex fittings are used for making connections in PEX plumbing applications. Professiomnal plubmers used next type of PEX fittings: Crimp fittings, Clamp fittings, Push Up fittings, Sharkbite fittings and others.
The different types of water heater fittings available in the market include compression fittings, solder fittings, push-to-connect fittings, and threaded fittings. These fittings are used to connect pipes and components in water heater systems.
The different types of PEX fittings available for plumbing applications include crimp fittings, push-to-connect fittings, and expansion fittings.
Compressing fittings, press fittings, and push-on fittings.