Aeroquip series 2081 (Ref. SAE 140140) Reducer-External Pipe/Internal Pipe Adapter.  Also available in stainless steel as part number 259-2081.
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2081 Pipe Adapter

2081 Reducer-External Pipe/Internal Pipe
2081 Pipe Adapter

2081 Reducer-External Pipe/Internal Pipe
2081 Pipe Adapter

2081 Reducer-External Pipe/Internal Pipe
2081 Pipe Adapter

2081 Reducer-External Pipe/Internal Pipe
2081 Pipe Adapter

2081 Reducer-External Pipe/Internal Pipe
Thread P1 N/A 1/4-18 N/A 3/8-18 N/A 3/8-18 N/A 1/2-14 N/A 1/2-14
Thread P2 N/A 1/8-27 N/A 1/8-27 N/A 1/4-18 N/A 1/8-27 N/A 1/4-18