I cannot find a 1/4 inch male to 1/8 inch male brass fitting and a 1/4 female to 3/8 male fittings. I tried 2 Depots, 2 Lowes, 2 Ace and a Gilroys. Anybody have any ideas.
Can you find a 1/4" female to 1/8" male AND a 1/4" close coupling? Do the same thing for the 3/8" male to 1/4" male and put a short 1/4" coupling between. You may have to check out the Stainless Steel selection, or even talk to a plumbing supply house.
Use 'bushings' and 'nipples'. A 1/4 to 1/8 inch bushing with a 1/8 inch nipple and a 3/8 to 1/4 inch bushing. It's more joints, but the parts are easier to find.