Brass Short Shank Type Fitting, 0.25 Inch Hose ID to 7/16-20 SAE 45 deg Flare, Straight

Brass is exactly what you've got here. Machined from free cutting brass rod, CDA 360 alloy specifically, so it's a solid material choice for low pressure fluid transfer including suction and discharge lines. Just keep in mind the working pressure you can expect out of it will depend on the hose itself, the clamps you're using, how many clamps are on there, placement, and what fluid you're running through it. The fitting doesn't carry a fixed pressure rating independent of those factors.