I use the Surplus Center 9-7682-11 for Cat. 1 3/4" pins and comes with BSPPM to 3/8" NPTM adapters and lock valve for cylinder drifting. Easy bolt on that gives a range of ~ 21" - 32". I need the 32" extended length. Make sure the port connection box is turned 90 degrees either way from the photo as no matter which direction the box is located (top or bottom), the fitting may hit something and bend that top assembly. Did it myself.