The fitting is a straight compression fitting, it is made of AISI 316 stainless steel, it is used to connect the tube to a threaded piece, this coupling is for a fixed connection between pipe and stainless steel pipe. A double ferrule fitting connects to pipe at one end to achieve a leak-resistant seal in high pressure, high vacuum and high vibration applications, and a male NPT/BSP connector at the other end connects to a threaded pipe.

These compression fittings require no tools or sealants and are useful in installations, using a nut and ferrule system to attach the tube to a threaded part.

Male NPT/BSP threads on one end and pipe connection on the other.
316 stainless steel for strength and greater corrosion resistance.
Double ferrule construction for added leak resistance.
Since it has a compression ring connection, it can only be used once