Although there is no description of detailed dimensions, it is a male PT 1/2 female PT 3/8 type with an actual face of 22 mm, diagonal 30.5 mm, total height of 37 mm, male side inner diameter of 13 mm, female side inner diameter of 14.3. Compact, but the inside diameter is large. Edges are aligned and there is no burr. It is a very good product.
This series which was machined by scraping off stainless steel lumps is very accurate, quality superior to the price! In addition, the Chiyoda Tsusho brand, the part number has been etched in one corner, and it is a commodity that I want to put in the first choice of part selection.