Buy 45 degree angled elbow for flare tube to male Npt. 45 degree elbows allow for better less turbulant flow than L 90 degree shaped elbows when space permits. These brass sae 45 degree tube flare to male Npt fittings are great for connecting npt pipe to copper or steel flared tubing. Commonly used in refridgerant, natural gas, and propane applications. For use with gas supply lines, air conditioners, freezers and burners.