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2 inch close nipple Nipples (371) Nipples, Running Thread, Enlargers (398) RadioRA 2 (839) Squeeze Connector: 90 Degree 2 Screw (87) Transformers (1311) Small Terminals, Forks, Rings (1435) Fuses & Accessories (1883) 2-Pole Contactors (93)
The threads are standard 3/4 male (IPS) on one side and standard 1/2 male (IPS) threads on the other side with very little room in between. Generally in the plumbing industry this would be considered a close nipple and it is called a 3/4 x 1/2 reducing nipple.