The size is and for plumbing and heating
A fitting that forms an angle of less than 180 degrees (3.141 radians) from a straight flow. Both connecting ends have machine threads (straight threads other than pipe or hose series) designed to accommodate a tube or is unthreaded and designed to accommodate a tube. It may have side or heel inlet(s). See also elbow, pipe and connector, multiple, fluid pressure line.
Classification: Copper alloy tube or pipe fittings
NSN 5915-01-212-7188
NSN 5999-00-997-8103
NSN 5998-00-535-9190
NSN 5855-01-433-2220
NSN 6685-00-935-6961
NSN 5905-01-342-3349
NSN 5915-01-442-6711
NSN 6135-01-551-0562
NSN 6240-01-397-5683
NSN 5975-01-144-6132
NSN 6610-00-768-4559
NSN 5935-01-441-2414