The Weldmark by Superior WEM PTF-4F-48 pigtail for compressed gas use is used to connect a manifold to compressed gas cylinders. It is braided stainless steel, 48in in length, with brass female right hand NPT .25in thread size on both ends. It can be operated to a max temperature of 450°F, at maximum working pressure of 3000psi. Prop65 Warning: This product may contain materials known to cause cancer or reproductive harm. Made in United States.