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 5855-00-004-0904
NSN 5905-01-076-6301
NSN 6220-00-229-4125
NSN 2925-00-246-3077
NSN 5895-01-659-0238
NSN 6105-01-093-7413
NSN 5975-01-487-7080
NSN 6150-00-518-6651
NSN 5905-00-973-7079
NSN 5905-01-381-2552
NSN 6645-00-143-1567
NSN 5855-00-832-9341